diff --git a/NUCE_2100/.ipynb_checkpoints/NUCE 2100 Midterm 1-checkpoint.ipynb b/NUCE_2100/.ipynb_checkpoints/NUCE 2100 Midterm 1-checkpoint.ipynb
index 4d0e095..4c5ad95 100644
--- a/NUCE_2100/.ipynb_checkpoints/NUCE 2100 Midterm 1-checkpoint.ipynb	
+++ b/NUCE_2100/.ipynb_checkpoints/NUCE 2100 Midterm 1-checkpoint.ipynb	
@@ -14,7 +14,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 1,
    "id": "af61cdf6-cb10-43e3-81b5-703acbc893a0",
    "metadata": {},
    "outputs": [],
@@ -57,7 +57,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 2,
    "id": "275ae694-977a-41fa-a75c-c221f1b0d653",
    "metadata": {},
    "outputs": [
@@ -106,7 +106,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 3,
    "id": "1c22a513-0351-4d2c-82c4-504f077b900d",
    "metadata": {},
    "outputs": [
@@ -143,7 +143,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": 4,
    "id": "2eded1a4-ad36-47f4-b634-037c157c20d1",
    "metadata": {},
    "outputs": [
@@ -168,7 +168,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
+   "execution_count": 5,
    "id": "12612512-63c0-468f-941e-209d21827ee9",
    "metadata": {},
    "outputs": [
@@ -219,7 +219,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 39,
+   "execution_count": 6,
    "id": "2f9c5cdb-d0ca-4eb9-9b6f-a1c6617db5d1",
    "metadata": {},
    "outputs": [
@@ -290,7 +290,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": 7,
    "id": "8d9faf3b-aac3-4a1f-9d07-464ea77d3290",
    "metadata": {},
    "outputs": [
@@ -356,7 +356,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
+   "execution_count": 8,
    "id": "2612afc1-e0dc-4078-a792-b83e946af822",
    "metadata": {},
    "outputs": [
@@ -422,7 +422,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 63,
+   "execution_count": 10,
    "id": "efab76fa-fbc8-4ea4-9d4f-f5790b0cfeb1",
    "metadata": {},
    "outputs": [
@@ -445,7 +445,7 @@
     "E_r = 200 * 1.60218e-13 #J\n",
     "#According to INL: https://mooseframework.inl.gov/bison/theory/power_burnup.html\n",
     "P_local = F_dot * E_r\n",
-    "answer_print('Question 6a', f'{P:4e} J')\n",
+    "answer_print('Question 6a', f'{P_local:4e} J')\n",
     "\n",
     "# Part B\n"
    ]
@@ -463,6 +463,50 @@
     "![Screenshot from 2024-10-07 10-42-09.png](attachment:35549a7a-ac6d-402c-bce6-1fb29f3a0e9e.png)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "id": "e669dab3-ef9a-460e-8fbc-9a99bbad623b",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Sodium-22 Activty: 4.183e+10 decay/s\n",
+      "Strontium-90 Activty: 3.928e+08 decay/s\n",
+      "\n",
+      "=========FINAL ANSWER=========\n",
+      "Question 7:\n",
+      "The sodium sample has higher activity.\n",
+      "It has 4.183e+10 decays/second compared to the Strontium sample's 3.928e+08 decays/second.\n",
+      "=========FINAL ANSWER=========\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "\"\"\"\n",
+    "Data pulled from https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html\n",
+    "\"\"\"\n",
+    "Na22_mass = 18.1 #g\n",
+    "Na22_half_life = 8_210_481_069_425 #s, beta decay\n",
+    "Na22_lambda = 0.693/Na22_half_life #decay/nuclei/s\n",
+    "Na22_N = Na22_mass*6.022141e23 / 21994437.55e-6 #nuclei\n",
+    "Na22_activity = Na22_lambda * Na22_N #decay/s\n",
+    "\n",
+    "Sr90_mass = 77.2 #g\n",
+    "Sr90_half_life = 912_310_730_946_708 #s, beta decay\n",
+    "Sr90_lambda = 0.693/Sr90_half_life #decay/nuclei/s\n",
+    "Sr90_N = Sr90_mass*6.022141e23 / 89907727e-6 #nuclei\n",
+    "Sr90_activity = Sr90_lambda * Sr90_N #decay/s\n",
+    "\n",
+    "print(f'Sodium-22 Activty: {Na22_activity:.3e} decay/s')\n",
+    "print(f'Strontium-90 Activty: {Sr90_activity:.3e} decay/s')\n",
+    "\n",
+    "answer_print('Question 7',f'The sodium sample has higher activity.\\nIt has {Na22_activity:.3e} decays/second compared to the Strontium sample\\'s {Sr90_activity:.3e} decays/second.')"
+   ]
+  },
   {
    "attachments": {
     "cded4647-fbb4-409b-8c3b-f070b55060f3.png": {
@@ -476,6 +520,37 @@
     "![Screenshot from 2024-10-07 10-42-23.png](attachment:cded4647-fbb4-409b-8c3b-f070b55060f3.png)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "id": "f3570a43-0a14-44c4-9237-e3e1f595535d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "=========FINAL ANSWER=========\n",
+      "Question 8a:\n",
+      "The atomic density of Pu239 in this reactor is 3.3757e+22 atoms/cm^3.\n",
+      "=========FINAL ANSWER=========\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "Pu239_density = 13.4 #g/cm^3\n",
+    "v = 2.88\n",
+    "Sigma_f = 1.8 #barns\n",
+    "Sigma_a = 2.1 #barns\n",
+    "D = 1.5 #cm\n",
+    "\n",
+    "# Part A\n",
+    "N_Pu239 = 100/100*Pu239_density*6.0221409e23/Pu239_mass\n",
+    "answer_print('Question 8a', f'The atomic density of Pu239 in this reactor is {N_Pu239:.4e} atoms/cm^3.')\n"
+   ]
+  },
   {
    "attachments": {
     "c4932019-fecd-47c5-a7e3-54150a2f6d67.png": {
@@ -491,30 +566,45 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 64,
+   "execution_count": 18,
    "id": "c0c96c53-4ef8-4367-9d7c-0d9688aff15d",
    "metadata": {},
    "outputs": [
     {
-     "ename": "TypeError",
-     "evalue": "array() missing required argument 'object' (pos 0)",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "Cell \u001b[0;32mIn[64], line 5\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[38;5;124;03m\"\"\"\u001b[39;00m\n\u001b[1;32m      2\u001b[0m \u001b[38;5;124;03mI know wikipedia is not a fantastic source... but they have a convenient table listing isotopes of tin with their abundance.\u001b[39;00m\n\u001b[1;32m      3\u001b[0m \u001b[38;5;124;03mhttps://en.wikipedia.org/wiki/Isotopes_of_tin\u001b[39;00m\n\u001b[1;32m      4\u001b[0m \u001b[38;5;124;03m\"\"\"\u001b[39;00m\n\u001b[0;32m----> 5\u001b[0m tin_stats \u001b[38;5;241m=\u001b[39m \u001b[43mnp\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43marray\u001b[49m\u001b[43m(\u001b[49m\n\u001b[1;32m      6\u001b[0m \u001b[43m)\u001b[49m\n",
-      "\u001b[0;31mTypeError\u001b[0m: array() missing required argument 'object' (pos 0)"
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "=========FINAL ANSWER=========\n",
+      "Question 9:\n",
+      "My calculated value for elemental mass of tin is 118.71011.\n",
+      "The periodic table value is 118.71000.\n",
+      "That is a 0.00010% error.\n",
+      "=========FINAL ANSWER=========\n",
+      "\n"
      ]
     }
    ],
    "source": [
     "\"\"\"\n",
-    "I know wikipedia is not a fantastic source... but they have a convenient table listing isotopes of tin with their abundance.\n",
+    "Here is where I found a list of isotope abuncance and masses:\n",
     "https://en.wikipedia.org/wiki/Isotopes_of_tin\n",
     "\"\"\"\n",
-    "tin_stats = np.array(\n",
-    ")\n",
-    "\n"
+    "tin_stats = np.array([\n",
+    "    [112, 114, 115, 116, 117, 118, 119, 120, 122, 124], #Number\n",
+    "    [111.9048249, 113.90278013, 114.903344695, 115.90174283, 116.90295404, 117.90160663, 118.90331127, 119.90220256, 121.9034455, 123.9052796], # atomic mass (amu)\n",
+    "    [0.0097, 0.0066, 0.0034, 0.1454, 0.0768, 0.2422, 0.0859, 0.3258, 0.0463, 0.0579] # Abundance\n",
+    "])\n",
+    "\n",
+    "tin_elemental_mass = np.sum(tin_stats[1,:]*tin_stats[2,:])\n",
+    "\n",
+    "\"\"\"\n",
+    "For a periodic table, I am using the result when you just Google 'Periodic table'.\n",
+    "https://www.google.com/search?kgmid=%2Fm%2F05rbs&hl=en-US&q=Periodic%20table&shndl=17&source=sh%2Fx%2Fkp%2Fosrp%2Fm5%2F1&kgs=91de64a89fb9bd4b\n",
+    "\"\"\"\n",
+    "tin_perioic_table = 118.71 #amu\n",
+    "\n",
+    "answer_print('Question 9', f'My calculated value for elemental mass of tin is {tin_elemental_mass:.5f}.\\nThe periodic table value is {tin_perioic_table:.5f}.\\nThat is a {(tin_elemental_mass-tin_perioic_table)/tin_perioic_table*100:.5f}% error.')"
    ]
   },
   {
@@ -529,6 +619,25 @@
    "source": [
     "![Screenshot from 2024-10-07 10-42-48.png](attachment:4746ba32-86ce-4623-8715-3aae365e20d8.png)"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "481593ef-6dee-4507-a8ba-c902b56cbad7",
+   "metadata": {},
+   "source": [
+    "| Question | True / False |\n",
+    "| ------- | -------|\n",
+    "| 10A | False |\n",
+    "| 10B | True |\n",
+    "| 10C | False |\n",
+    "| 10D | True |\n",
+    "| 10E | True |\n",
+    "| 10F | True |\n",
+    "| 10G | True |\n",
+    "| 10H | False |\n",
+    "| 10I | True |\n",
+    "| 10J | True |"
+   ]
   }
  ],
  "metadata": {
diff --git a/NUCE_2100/NUCE 2100 Midterm 1.ipynb b/NUCE_2100/NUCE 2100 Midterm 1.ipynb
index 4d0e095..4c5ad95 100644
--- a/NUCE_2100/NUCE 2100 Midterm 1.ipynb	
+++ b/NUCE_2100/NUCE 2100 Midterm 1.ipynb	
@@ -14,7 +14,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 1,
    "id": "af61cdf6-cb10-43e3-81b5-703acbc893a0",
    "metadata": {},
    "outputs": [],
@@ -57,7 +57,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 2,
    "id": "275ae694-977a-41fa-a75c-c221f1b0d653",
    "metadata": {},
    "outputs": [
@@ -106,7 +106,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 3,
    "id": "1c22a513-0351-4d2c-82c4-504f077b900d",
    "metadata": {},
    "outputs": [
@@ -143,7 +143,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": 4,
    "id": "2eded1a4-ad36-47f4-b634-037c157c20d1",
    "metadata": {},
    "outputs": [
@@ -168,7 +168,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
+   "execution_count": 5,
    "id": "12612512-63c0-468f-941e-209d21827ee9",
    "metadata": {},
    "outputs": [
@@ -219,7 +219,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 39,
+   "execution_count": 6,
    "id": "2f9c5cdb-d0ca-4eb9-9b6f-a1c6617db5d1",
    "metadata": {},
    "outputs": [
@@ -290,7 +290,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": 7,
    "id": "8d9faf3b-aac3-4a1f-9d07-464ea77d3290",
    "metadata": {},
    "outputs": [
@@ -356,7 +356,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
+   "execution_count": 8,
    "id": "2612afc1-e0dc-4078-a792-b83e946af822",
    "metadata": {},
    "outputs": [
@@ -422,7 +422,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 63,
+   "execution_count": 10,
    "id": "efab76fa-fbc8-4ea4-9d4f-f5790b0cfeb1",
    "metadata": {},
    "outputs": [
@@ -445,7 +445,7 @@
     "E_r = 200 * 1.60218e-13 #J\n",
     "#According to INL: https://mooseframework.inl.gov/bison/theory/power_burnup.html\n",
     "P_local = F_dot * E_r\n",
-    "answer_print('Question 6a', f'{P:4e} J')\n",
+    "answer_print('Question 6a', f'{P_local:4e} J')\n",
     "\n",
     "# Part B\n"
    ]
@@ -463,6 +463,50 @@
     "![Screenshot from 2024-10-07 10-42-09.png](attachment:35549a7a-ac6d-402c-bce6-1fb29f3a0e9e.png)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "id": "e669dab3-ef9a-460e-8fbc-9a99bbad623b",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Sodium-22 Activty: 4.183e+10 decay/s\n",
+      "Strontium-90 Activty: 3.928e+08 decay/s\n",
+      "\n",
+      "=========FINAL ANSWER=========\n",
+      "Question 7:\n",
+      "The sodium sample has higher activity.\n",
+      "It has 4.183e+10 decays/second compared to the Strontium sample's 3.928e+08 decays/second.\n",
+      "=========FINAL ANSWER=========\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "\"\"\"\n",
+    "Data pulled from https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html\n",
+    "\"\"\"\n",
+    "Na22_mass = 18.1 #g\n",
+    "Na22_half_life = 8_210_481_069_425 #s, beta decay\n",
+    "Na22_lambda = 0.693/Na22_half_life #decay/nuclei/s\n",
+    "Na22_N = Na22_mass*6.022141e23 / 21994437.55e-6 #nuclei\n",
+    "Na22_activity = Na22_lambda * Na22_N #decay/s\n",
+    "\n",
+    "Sr90_mass = 77.2 #g\n",
+    "Sr90_half_life = 912_310_730_946_708 #s, beta decay\n",
+    "Sr90_lambda = 0.693/Sr90_half_life #decay/nuclei/s\n",
+    "Sr90_N = Sr90_mass*6.022141e23 / 89907727e-6 #nuclei\n",
+    "Sr90_activity = Sr90_lambda * Sr90_N #decay/s\n",
+    "\n",
+    "print(f'Sodium-22 Activty: {Na22_activity:.3e} decay/s')\n",
+    "print(f'Strontium-90 Activty: {Sr90_activity:.3e} decay/s')\n",
+    "\n",
+    "answer_print('Question 7',f'The sodium sample has higher activity.\\nIt has {Na22_activity:.3e} decays/second compared to the Strontium sample\\'s {Sr90_activity:.3e} decays/second.')"
+   ]
+  },
   {
    "attachments": {
     "cded4647-fbb4-409b-8c3b-f070b55060f3.png": {
@@ -476,6 +520,37 @@
     "![Screenshot from 2024-10-07 10-42-23.png](attachment:cded4647-fbb4-409b-8c3b-f070b55060f3.png)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "id": "f3570a43-0a14-44c4-9237-e3e1f595535d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "=========FINAL ANSWER=========\n",
+      "Question 8a:\n",
+      "The atomic density of Pu239 in this reactor is 3.3757e+22 atoms/cm^3.\n",
+      "=========FINAL ANSWER=========\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "Pu239_density = 13.4 #g/cm^3\n",
+    "v = 2.88\n",
+    "Sigma_f = 1.8 #barns\n",
+    "Sigma_a = 2.1 #barns\n",
+    "D = 1.5 #cm\n",
+    "\n",
+    "# Part A\n",
+    "N_Pu239 = 100/100*Pu239_density*6.0221409e23/Pu239_mass\n",
+    "answer_print('Question 8a', f'The atomic density of Pu239 in this reactor is {N_Pu239:.4e} atoms/cm^3.')\n"
+   ]
+  },
   {
    "attachments": {
     "c4932019-fecd-47c5-a7e3-54150a2f6d67.png": {
@@ -491,30 +566,45 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 64,
+   "execution_count": 18,
    "id": "c0c96c53-4ef8-4367-9d7c-0d9688aff15d",
    "metadata": {},
    "outputs": [
     {
-     "ename": "TypeError",
-     "evalue": "array() missing required argument 'object' (pos 0)",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "Cell \u001b[0;32mIn[64], line 5\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[38;5;124;03m\"\"\"\u001b[39;00m\n\u001b[1;32m      2\u001b[0m \u001b[38;5;124;03mI know wikipedia is not a fantastic source... but they have a convenient table listing isotopes of tin with their abundance.\u001b[39;00m\n\u001b[1;32m      3\u001b[0m \u001b[38;5;124;03mhttps://en.wikipedia.org/wiki/Isotopes_of_tin\u001b[39;00m\n\u001b[1;32m      4\u001b[0m \u001b[38;5;124;03m\"\"\"\u001b[39;00m\n\u001b[0;32m----> 5\u001b[0m tin_stats \u001b[38;5;241m=\u001b[39m \u001b[43mnp\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43marray\u001b[49m\u001b[43m(\u001b[49m\n\u001b[1;32m      6\u001b[0m \u001b[43m)\u001b[49m\n",
-      "\u001b[0;31mTypeError\u001b[0m: array() missing required argument 'object' (pos 0)"
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "=========FINAL ANSWER=========\n",
+      "Question 9:\n",
+      "My calculated value for elemental mass of tin is 118.71011.\n",
+      "The periodic table value is 118.71000.\n",
+      "That is a 0.00010% error.\n",
+      "=========FINAL ANSWER=========\n",
+      "\n"
      ]
     }
    ],
    "source": [
     "\"\"\"\n",
-    "I know wikipedia is not a fantastic source... but they have a convenient table listing isotopes of tin with their abundance.\n",
+    "Here is where I found a list of isotope abuncance and masses:\n",
     "https://en.wikipedia.org/wiki/Isotopes_of_tin\n",
     "\"\"\"\n",
-    "tin_stats = np.array(\n",
-    ")\n",
-    "\n"
+    "tin_stats = np.array([\n",
+    "    [112, 114, 115, 116, 117, 118, 119, 120, 122, 124], #Number\n",
+    "    [111.9048249, 113.90278013, 114.903344695, 115.90174283, 116.90295404, 117.90160663, 118.90331127, 119.90220256, 121.9034455, 123.9052796], # atomic mass (amu)\n",
+    "    [0.0097, 0.0066, 0.0034, 0.1454, 0.0768, 0.2422, 0.0859, 0.3258, 0.0463, 0.0579] # Abundance\n",
+    "])\n",
+    "\n",
+    "tin_elemental_mass = np.sum(tin_stats[1,:]*tin_stats[2,:])\n",
+    "\n",
+    "\"\"\"\n",
+    "For a periodic table, I am using the result when you just Google 'Periodic table'.\n",
+    "https://www.google.com/search?kgmid=%2Fm%2F05rbs&hl=en-US&q=Periodic%20table&shndl=17&source=sh%2Fx%2Fkp%2Fosrp%2Fm5%2F1&kgs=91de64a89fb9bd4b\n",
+    "\"\"\"\n",
+    "tin_perioic_table = 118.71 #amu\n",
+    "\n",
+    "answer_print('Question 9', f'My calculated value for elemental mass of tin is {tin_elemental_mass:.5f}.\\nThe periodic table value is {tin_perioic_table:.5f}.\\nThat is a {(tin_elemental_mass-tin_perioic_table)/tin_perioic_table*100:.5f}% error.')"
    ]
   },
   {
@@ -529,6 +619,25 @@
    "source": [
     "![Screenshot from 2024-10-07 10-42-48.png](attachment:4746ba32-86ce-4623-8715-3aae365e20d8.png)"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "481593ef-6dee-4507-a8ba-c902b56cbad7",
+   "metadata": {},
+   "source": [
+    "| Question | True / False |\n",
+    "| ------- | -------|\n",
+    "| 10A | False |\n",
+    "| 10B | True |\n",
+    "| 10C | False |\n",
+    "| 10D | True |\n",
+    "| 10E | True |\n",
+    "| 10F | True |\n",
+    "| 10G | True |\n",
+    "| 10H | False |\n",
+    "| 10I | True |\n",
+    "| 10J | True |"
+   ]
   }
  ],
  "metadata": {