Let’s go step by step to solve this worksheet.
---
Part 1: Label the parts of the atom below (protons, neutrons, electrons, nucleus)
Looking at the diagram:
- The
center cluster with “+” and “0” symbols is the
nucleus.
- Inside the nucleus:
- Particles with “+” are
protons
- Particles with “0” are
neutrons
- The particles orbiting outside on rings are
electrons (they have “–” signs)
So labels should be:
→ Arrow pointing to center cluster →
Nucleus
→ Arrow pointing to a “+” particle inside nucleus →
Proton
→ Arrow pointing to a “0” particle inside nucleus →
Neutron
→ Arrow pointing to an outer “–” particle →
Electron
*(Note: Since we can’t draw here, you’d write these words next to the arrows in your worksheet.)*
---
Part 2: Answer the following questions
Let’s answer each one carefully.
---
1. ___what___ part of the atom has no charge?
→ Neutrons have no charge (they’re neutral).
✔ Answer:
Neutron
---
2. ___what___ part of the atom has a positive charge?
→ Protons are positively charged.
✔ Answer:
Proton
---
3. ___what___ part of the atom has a negative charge?
→ Electrons are negatively charged.
✔ Answer:
Electron
---
4. ___how many___ electrons can be kept in the first orbital (closest to the nucleus)?
→ First shell (orbital) holds max
2 electrons.
✔ Answer:
2
---
5. ___how many___ electrons can be kept in the second orbital?
→ Second shell holds max
8 electrons.
✔ Answer:
8
---
6. ___how many___ electrons can be kept in the third orbital?
→ Third shell also holds max
8 for basic atomic structure (in early chemistry levels — though it can hold more later, but for this level, it’s 8).
✔ Answer:
8
*(Note: In advanced chemistry, third shell can hold up to 18, but for middle/high school intro, they teach 2-8-8 rule.)*
---
7. There are the same number of these two particles in an atom.
→ In a neutral atom, number of
protons = number of electrons.
✔ Answer:
Protons and electrons
---
8. The atomic number is the same as the total number of these particles.
→ Atomic number = number of
protons.
✔ Answer:
Protons
---
9. ___the___ mass number is determined by which particles?
→ Mass number = protons + neutrons (since electrons are too light to count).
✔ Answer:
Protons and neutrons
---
Now let’s double-check all answers for accuracy:
- Charges: proton (+), electron (–), neutron (0) → correct.
- Electron shells: 1st=2, 2nd=8, 3rd=8 (for introductory level) → correct.
- Neutral atom: protons = electrons → correct.
- Atomic number = protons → correct.
- Mass number = protons + neutrons → correct.
All answers match standard basic atomic theory taught in schools.
---
Final Answer:
Part 1 Labels (write next to arrows):
- Center cluster → Nucleus
- “+” particle in center → Proton
- “0” particle in center → Neutron
- Outer “–” particle → Electron
Part 2 Answers:
1. Neutron
2. Proton
3. Electron
4. 2
5. 8
6. 8
7. Protons and electrons
8. Protons
9. Protons and neutrons
Parent Tip: Review the logic above to help your child master the concept of atom worksheet.
