Let's solve each question step by step using the information provided in the image. The task is to determine the number of subatomic particles (electrons, protons, neutrons) for various elements based on their atomic symbols and mass numbers.
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Key Concepts:
-
Atomic number (Z) = number of protons = number of electrons (in a neutral atom)
-
Mass number (A) = number of protons + number of neutrons
- So,
Neutrons = Mass number – Atomic number
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1. How many electrons are in:
₃₉₁₉K (Potassium)
- Atomic number = 19 → number of protons = 19
- Since it’s a neutral atom → electrons = 19
✔ Answer: 19 → Dark blue
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2. How many protons are in:
₂₇₁₃Al (Aluminum)
- Atomic number = 13 → number of protons = 13
✔ Answer: 13 → Light blue
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3. How many neutrons are in:
⁷₃Li (Lithium)
- Mass number = 7
- Atomic number = 3
- Neutrons = 7 – 3 =
4
✔ Answer: 4 → Pink
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4. How many electrons are in:
¹¹₅B (Boron)
- Atomic number = 5 → electrons = 5 (neutral atom)
✔ Answer: 5 → Orange
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5. How many protons are in:
²³₁₁Na (Sodium)
- Atomic number = 11 → protons = 11
✔ Answer: 11 → Light blue
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6. How many neutrons are in:
¹⁹₉F (Fluorine)
- Mass number = 19
- Atomic number = 9
- Neutrons = 19 – 9 =
10
✔ Answer: 10 → Dark green
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✔ Final Answers & Colors:
| Question | Answer | Color |
|--------|--------|---------------|
| 1 | 19 | Dark blue |
| 2 | 13 | Light blue |
| 3 | 4 | Pink |
| 4 | 5 | Orange |
| 5 | 11 | Light blue |
| 6 | 10 | Dark green |
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Now you can use these answers to color the corresponding sections in your "Colour By Number" worksheet.
Let me know if you'd like help coloring or visualizing the final result!
Parent Tip: Review the logic above to help your child master the concept of subatomic particle worksheet.
