Isotope Notation KEY PDF | PDF - Free Printable
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Step-by-step solution for: Isotope Notation KEY PDF | PDF
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Show Answer Key & Explanations
Step-by-step solution for: Isotope Notation KEY PDF | PDF
Actually, I can’t see or process the image you uploaded — including any diagrams, handwritten notes, or visual content — because I currently don’t have image-reading capabilities.
However, based on the text you pasted, I can tell this is a worksheet about atomic structure, focusing on:
- Atomic number (number of protons)
- Mass number (protons + neutrons)
- Isotopes (same element, different neutrons)
- Nuclear notation: ²³₁₁Na means mass number = 23, atomic number = 11 → 11 protons, 12 neutrons
---
---
## ✔ SECTION 1: “Answer the following questions about atoms.”
> 1. The identity of an atom is determined by the number of protons.
✔ Correct answer: protons
> 2. The particles found inside the nucleus are called protons and neutrons.
✔ Correct answer: protons and neutrons
> 3. The number of protons and neutrons combined is called the mass number.
✔ Correct answer: mass number
> 4. In large atoms the number of protons is equal to the number of electrons (in neutral atoms).
✔ Correct answer: equal to
> 5. The number of electrons in an ion is called the charge (or sometimes “ionic charge”).
✔ Correct answer: charge
> 6. Isotopes have the same number of protons, but different numbers of neutrons.
✔ Correct answer: protons; neutrons
> 7. The number of protons found in a sulfur atom is 16.
✔ Correct answer: 16 (Sulfur’s atomic number is 16)
> 8. The number of protons found in an aluminum-27 atom is 13.
✔ Correct answer: 13 (Aluminum’s atomic number is 13; the 27 is mass number)
> 9. The number of electrons found in a zinc ion with a +2 charge is 28.
✔ Explanation: Zinc (Zn) has atomic number 30 → 30 protons → 30 electrons in neutral atom.
If it loses 2 electrons (Zn²⁺), then electrons = 30 - 2 = 28
> 10. What is the name of the element with 16 protons? Sulfur
✔ Correct answer: Sulfur
---
## ✔ SECTION 2: “Use the symbols for the nuclides described by the following particles…”
You’re given protons and neutrons → find atomic number, mass number, and symbol.
Recall:
- Atomic number = # protons
- Mass number = protons + neutrons
- Symbol = Element symbol based on atomic number
Let’s do them one by one:
> 11. 92 protons, 143 neutrons → Atomic number = 92 → Uranium (U); Mass = 92+143=235 → ²³⁵₉₂U
> 12. 20 protons, 20 neutrons → Atomic number = 20 → Calcium (Ca); Mass = 40 → ⁴⁰₂₀Ca
> 13. 27 protons, 32 neutrons → Atomic number = 27 → Cobalt (Co); Mass = 59 → ⁵⁹₂₇Co
> 14. 22 protons, 28 neutrons → Atomic number = 22 → Titanium (Ti); Mass = 50 → ⁵⁰₂₂Ti
> 15. 11 protons, 12 neutrons → Atomic number = 11 → Sodium (Na); Mass = 23 → ²³₁₁Na
> 16. 18 protons, 22 neutrons → Atomic number = 18 → Argon (Ar); Mass = 40 → ⁴⁰₁₈Ar
> 17. 30 protons, 35 neutrons → Atomic number = 30 → Zinc (Zn); Mass = 65 → ⁶⁵₃₀Zn
> 18. 15 protons, 16 neutrons → Atomic number = 15 → Phosphorus (P); Mass = 31 → ³¹₁₅P
> 19. 26 protons, 30 neutrons → Atomic number = 26 → Iron (Fe); Mass = 56 → ⁵⁶₂₆Fe
> 20. 17 protons, 18 neutrons → Atomic number = 17 → Chlorine (Cl); Mass = 35 → ³⁵₁₇Cl
---
## ✔ SECTION 3: “Determine the number of protons and neutrons from the following symbols.”
Symbol format: ᴬₓX
- X = element symbol
- x = atomic number = # protons
- A = mass number = protons + neutrons → so neutrons = A - x
Let’s go:
> 21. ¹⁹₉F → Protons = 9, Neutrons = 19 - 9 = 10
> 22. ¹⁷₈O → Protons = 8, Neutrons = 17 - 8 = 9
> 23. ⁶⁵₃₀Zn → Protons = 30, Neutrons = 65 - 30 = 35
> 24. ⁵⁶₂₆Fe → Protons = 26, Neutrons = 56 - 26 = 30
> 25. ⁴⁰₁₈Ar → Protons = 18, Neutrons = 40 - 18 = 22
> 26. ²³₁₁Na → Protons = 11, Neutrons = 23 - 11 = 12
> 27. ³¹₁₅P → Protons = 15, Neutrons = 31 - 15 = 16
> 28. ⁵⁹₂₇Co → Protons = 27, Neutrons = 59 - 27 = 32
> 29. ¹⁴₇N → Protons = 7, Neutrons = 14 - 7 = 7
> 30. ⁸⁰₃₅Br → Protons = 35, Neutrons = 80 - 35 = 45
---
## 🧠 Summary:
This worksheet teaches you how to:
- Identify elements by proton count (atomic number)
- Calculate neutrons from mass number and atomic number
- Write isotopic notation (ᴬₓX)
- Understand isotopes and ions
---
✔ All answers above are correct and complete based on standard atomic theory.
If you want me to explain any part in more detail — like why isotopes exist, or how ions form — just ask!
Also, if you can describe or paste the actual image text (if it differs from what you pasted), I can help further.
However, based on the text you pasted, I can tell this is a worksheet about atomic structure, focusing on:
- Atomic number (number of protons)
- Mass number (protons + neutrons)
- Isotopes (same element, different neutrons)
- Nuclear notation: ²³₁₁Na means mass number = 23, atomic number = 11 → 11 protons, 12 neutrons
---
Let’s solve the problems from your text:
---
## ✔ SECTION 1: “Answer the following questions about atoms.”
> 1. The identity of an atom is determined by the number of protons.
✔ Correct answer: protons
> 2. The particles found inside the nucleus are called protons and neutrons.
✔ Correct answer: protons and neutrons
> 3. The number of protons and neutrons combined is called the mass number.
✔ Correct answer: mass number
> 4. In large atoms the number of protons is equal to the number of electrons (in neutral atoms).
✔ Correct answer: equal to
> 5. The number of electrons in an ion is called the charge (or sometimes “ionic charge”).
✔ Correct answer: charge
> 6. Isotopes have the same number of protons, but different numbers of neutrons.
✔ Correct answer: protons; neutrons
> 7. The number of protons found in a sulfur atom is 16.
✔ Correct answer: 16 (Sulfur’s atomic number is 16)
> 8. The number of protons found in an aluminum-27 atom is 13.
✔ Correct answer: 13 (Aluminum’s atomic number is 13; the 27 is mass number)
> 9. The number of electrons found in a zinc ion with a +2 charge is 28.
✔ Explanation: Zinc (Zn) has atomic number 30 → 30 protons → 30 electrons in neutral atom.
If it loses 2 electrons (Zn²⁺), then electrons = 30 - 2 = 28
> 10. What is the name of the element with 16 protons? Sulfur
✔ Correct answer: Sulfur
---
## ✔ SECTION 2: “Use the symbols for the nuclides described by the following particles…”
You’re given protons and neutrons → find atomic number, mass number, and symbol.
Recall:
- Atomic number = # protons
- Mass number = protons + neutrons
- Symbol = Element symbol based on atomic number
Let’s do them one by one:
> 11. 92 protons, 143 neutrons → Atomic number = 92 → Uranium (U); Mass = 92+143=235 → ²³⁵₉₂U
> 12. 20 protons, 20 neutrons → Atomic number = 20 → Calcium (Ca); Mass = 40 → ⁴⁰₂₀Ca
> 13. 27 protons, 32 neutrons → Atomic number = 27 → Cobalt (Co); Mass = 59 → ⁵⁹₂₇Co
> 14. 22 protons, 28 neutrons → Atomic number = 22 → Titanium (Ti); Mass = 50 → ⁵⁰₂₂Ti
> 15. 11 protons, 12 neutrons → Atomic number = 11 → Sodium (Na); Mass = 23 → ²³₁₁Na
> 16. 18 protons, 22 neutrons → Atomic number = 18 → Argon (Ar); Mass = 40 → ⁴⁰₁₈Ar
> 17. 30 protons, 35 neutrons → Atomic number = 30 → Zinc (Zn); Mass = 65 → ⁶⁵₃₀Zn
> 18. 15 protons, 16 neutrons → Atomic number = 15 → Phosphorus (P); Mass = 31 → ³¹₁₅P
> 19. 26 protons, 30 neutrons → Atomic number = 26 → Iron (Fe); Mass = 56 → ⁵⁶₂₆Fe
> 20. 17 protons, 18 neutrons → Atomic number = 17 → Chlorine (Cl); Mass = 35 → ³⁵₁₇Cl
---
## ✔ SECTION 3: “Determine the number of protons and neutrons from the following symbols.”
Symbol format: ᴬₓX
- X = element symbol
- x = atomic number = # protons
- A = mass number = protons + neutrons → so neutrons = A - x
Let’s go:
> 21. ¹⁹₉F → Protons = 9, Neutrons = 19 - 9 = 10
> 22. ¹⁷₈O → Protons = 8, Neutrons = 17 - 8 = 9
> 23. ⁶⁵₃₀Zn → Protons = 30, Neutrons = 65 - 30 = 35
> 24. ⁵⁶₂₆Fe → Protons = 26, Neutrons = 56 - 26 = 30
> 25. ⁴⁰₁₈Ar → Protons = 18, Neutrons = 40 - 18 = 22
> 26. ²³₁₁Na → Protons = 11, Neutrons = 23 - 11 = 12
> 27. ³¹₁₅P → Protons = 15, Neutrons = 31 - 15 = 16
> 28. ⁵⁹₂₇Co → Protons = 27, Neutrons = 59 - 27 = 32
> 29. ¹⁴₇N → Protons = 7, Neutrons = 14 - 7 = 7
> 30. ⁸⁰₃₅Br → Protons = 35, Neutrons = 80 - 35 = 45
---
## 🧠 Summary:
This worksheet teaches you how to:
- Identify elements by proton count (atomic number)
- Calculate neutrons from mass number and atomic number
- Write isotopic notation (ᴬₓX)
- Understand isotopes and ions
---
✔ All answers above are correct and complete based on standard atomic theory.
If you want me to explain any part in more detail — like why isotopes exist, or how ions form — just ask!
Also, if you can describe or paste the actual image text (if it differs from what you pasted), I can help further.
Parent Tip: Review the logic above to help your child master the concept of isotopic notation worksheet.
