Chemistry of Life Worksheet I with completed Bohr models and atomic data for various elements.

You’ve uploaded a completed “Chemistry of Life Worksheet I” that asks students to fill in Bohr models and atomic information for several elements. Since the worksheet is already filled out (with red handwriting), I’ll verify each answer, explain the concepts, and point out any corrections or clarifications needed.

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## ✔ OVERVIEW OF WHAT’S BEING TESTED:
This worksheet tests understanding of:
- Element symbols
- Atomic number = number of protons = number of electrons (in neutral atoms)
- Atomic mass ≈ protons + neutrons
- Electron shell configuration (Bohr model)
- Element families/groups

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# 🔍 DETAILED REVIEW BY ELEMENT:

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1. Hydrogen (H)

- ✔ Symbol: H — Correct.
- ✔ No. of Electrons: 1 — Correct (atomic number = 1).
- ✔ Atomic Number: 1 — Correct.
- ✔ Atomic Mass: 1 — Approximate; actual is ~1.008, but often rounded to 1 for simplicity.
- ✔ Bohr Model: 1 proton, 0 neutrons (for protium, most common isotope), 1 electron in first shell — Correct.

> ✔️ All correct.

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2. Carbon (C)

- ✔ Symbol: C — Correct.
- ✔ No. of Electrons: 6 — Correct (atomic number = 6).
- ✔ Atomic Number: 6 — Correct.
- ✔ Atomic Mass: 12 — Correct (most common isotope: Carbon-12).
- ✔ Bohr Model: 6 protons, 6 neutrons, 2 electrons in inner shell, 4 in outer — Correct.

> ✔️ All correct.

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3. Phosphorus (P)

- ✔ Symbol: P — Correct.
- ✔ No. of Electrons: 15 — Correct (atomic number = 15).
- ✔ Atomic Number: 15 — Correct.
- ✔ Atomic Mass: 31 — Correct (most common isotope: Phosphorus-31).
- ⚠️ Family: Nitrogen Family — Technically correct! Phosphorus is in Group 15 (VA), also called the Nitrogen family (N, P, As, Sb, Bi). Sometimes called “pnictogens.”

> ✔️ All correct. Good job!

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4. Chlorine (Cl)

- ✔ Symbol: Cl — Correct (note: written as “CI” in image — typo! Should be Cl with lowercase ‘l’).
- ✔ No. of Electrons: 17 — Correct (atomic number = 17).
- ✔ Atomic Number: 17 — Correct.
- ✔ Atomic Mass: 35 — Close; actual average atomic mass is ~35.45. But Cl-35 is a common isotope, so acceptable for this level.
- ✔ Bohr Model: p=17, n=18 → mass = 35 → correct for Cl-35.
- ✔ Family: Halogens — Correct (Group 17).

> ❗ Correction: Symbol should be Cl, not “CI”.

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5. Oxygen (O)

- ✔ Symbol: O — Correct.
- ✔ No. of Electrons: 8 — Correct (atomic number = 8).
- ✔ Atomic Number: 8 — Correct.
- ✔ Atomic Mass: 16 — Correct (most common isotope: Oxygen-16).
- ✔ Bohr Model: 8 protons, 8 neutrons, 2 in first shell, 6 in second — Correct.
- ✔ Family: Oxygen Family — Also known as Chalcogens (Group 16: O, S, Se, Te, Po).

> ✔️ All correct.

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6. Sodium (Na)

- ✔ Symbol: Na — Correct.
- ✔ No. of Electrons: 11 — Correct (atomic number = 11).
- ✔ Atomic Number: 11 — Correct.
- ✔ Atomic Mass: 23 — Correct (most common isotope: Sodium-23).
- ✔ Bohr Model: p=11, n=12 → mass=23 — Correct.
- ✔ Family: Alkali Metals — Correct (Group 1: Li, Na, K, Rb, Cs, Fr).

> ✔️ All correct.

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7. Potassium (K)

- ✔ Symbol: K — Correct.
- ✔ No. of Electrons: 19 — Correct (atomic number = 19).
- ✔ Atomic Number: 19 — Correct.
- ✔ Atomic Mass: 39 — Correct (most common isotope: Potassium-39).
- ✔ Bohr Model: p=19, n=20 → mass=39 — Correct.
- ✔ Family: Alkali Metals — Correct.

> ✔️ All correct.

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8. Nitrogen (N)

- ✔ Symbol: N — Correct.
- ✔ No. of Electrons: 7 — Correct (atomic number = 7).
- ✔ Atomic Number: 7 — Correct.
- ✔ Atomic Mass: 14 — Correct (most common isotope: Nitrogen-14).
- ✔ Bohr Model: p=7, n=7 → mass=14 — Correct.
- ✔ Family: Nitrogen Family — Correct (Group 15).

> ✔️ All correct.

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## 📌 SUMMARY OF CORRECTIONS / NOTES:

| Element | Issue | Correction |
|-------------|----------------------------------|-------------------------------------|
| Chlorine | Symbol written as "CI" | Should be Cl (capital C, lowercase l) |

All other answers are accurate and well done!

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## 🧠 EXPLANATION OF KEY CONCEPTS:

➤ Atomic Number = Protons = Electrons (in neutral atom)

This defines the element’s identity.

➤ Atomic Mass ≈ Protons + Neutrons

We use the most common isotope’s mass unless told otherwise.

➤ Bohr Model Rules:

- Electrons fill shells in order: 1st shell max 2, 2nd max 8, 3rd max 8 (for first 20 elements).
- Example: Sodium (11 e⁻) → 2 in first, 8 in second, 1 in third.

➤ Element Families:

- Alkali Metals: Group 1 (Na, K) — very reactive metals.
- Halogens: Group 17 (Cl) — very reactive nonmetals.
- Nitrogen Family: Group 15 (N, P) — varied properties.
- Oxygen Family: Group 16 (O, S) — chalcogens.

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## 🎯 FINAL VERDICT:
✔ The worksheet is mostly perfect — only one small symbol error (“CI” → “Cl”) for chlorine.

Great work on understanding atomic structure and periodic trends!

Let me know if you’d like to turn this into a study guide or need practice problems!