Let's solve the worksheet step by step and fill in all the missing information.
---
Part 1: Fill in the missing information for an atom of Helium
We are given a diagram of a helium atom with three types of subatomic particles shown:
- Yellow circle with
– =
Electron
- Red circle with
+ =
Proton
- Green circle (no charge symbol) =
Neutron
So, the answers are:
1.
Yellow (–) =
Electron
2.
Red (+) =
Proton
3.
Green =
Neutron
> 🔬 Note: In the atomic model shown, helium has:
> - 2 protons (red)
> - 2 neutrons (green)
> - 2 electrons (yellow), orbiting the nucleus
---
Part 2: Reading the Periodic Table – Oxygen Example
We are given the periodic table box for
Oxygen:
```
8
O
Oxygen
15.999
```
Now let’s fill in the blanks based on what each part means.
---
####
Atomic Number: The ________ number.
-
Answer: The
top number.
- It is the number of
protons in an atom.
- It also tells us the number of
electrons (in a neutral atom).
✔ So:
- Atomic number =
8 → means 8 protons and 8 electrons (if neutral)
---
####
Atomic Mass: The number at the ________.
-
Answer: The number at the
bottom.
- It is the average
mass of the atom.
- It is the number of
protons PLUS (+) the number of neutrons in the nucleus.
✔ So:
- Atomic mass ≈
15.999 → rounded to
16
- This means: 8 protons + 8 neutrons = 16 nucleons (protons + neutrons)
---
✔ Final Answers:
####
Subatomic Particles:
- Yellow (–) =
Electron
- Red (+) =
Proton
- Green =
Neutron
####
Periodic Table Section:
Atomic number:
- The
top number.
- It is the number of
protons in an atom.
- It also tells us the number of
electrons.
Atomic mass:
- The number at the
bottom.
- It is the average
mass of the atom.
- It is the number of
protons PLUS (+) the number of
neutrons in the nucleus.
---
📌 Summary of Oxygen (O):
| Property | Value |
|------------------|--------------|
| Atomic Number | 8 |
| Protons | 8 |
| Electrons | 8 (neutral) |
| Atomic Mass | ~15.999 u |
| Neutrons | 8 (16 - 8) |
---
This completes the worksheet! Let me know if you'd like a printable version or explanation for other elements.
Parent Tip: Review the logic above to help your child master the concept of subatomic particle worksheet.
