Question

Complete the following chart for each element given. (show math)
ELEMENT


# OF PROTONS
# OF NEUTRONS
# OF ELECTRONS
Arsenic , As

Boron, B

Platinum, Pt

Gold, Au

Neon, Ne

Answer 1

To complete the chart, we will need the atomic number (which tells us the number of protons), the atomic mass (which helps us find the number of neutrons), and the number of electrons (which is equal to the number of protons in a neutral atom) for each element.

### Element Information
1. **Arsenic (As)**
- Atomic number: 33 (number of protons)
- Atomic mass: ~74.92 (approximate, average; we will use the closest whole number for neutrons)
- Neutrons = Atomic mass - Atomic number = 75 - 33 = 42 (rounding 74.92 to 75)
- Electrons = Number of protons = 33

2. **Boron (B)**
- Atomic number: 5 (number of protons)
- Atomic mass: ~10.81 (we will again use the closest whole number)
- Neutrons = Atomic mass - Atomic number = 11 - 5 = 6 (rounding 10.81 to 11)
- Electrons = Number of protons = 5

3. **Platinum (Pt)**
- Atomic number: 78 (number of protons)
- Atomic mass: ~195.08 (using the closest whole number)
- Neutrons = Atomic mass - Atomic number = 195 - 78 = 117 (rounding 195.08 to 195)
- Electrons = Number of protons = 78

4. **Gold (Au)**
- Atomic number: 79 (number of protons)
- Atomic mass: ~197 (approximate whole number)
- Neutrons = Atomic mass - Atomic number = 197 - 79 = 118
- Electrons = Number of protons = 79

5. **Neon (Ne)**
- Atomic number: 10 (number of protons)
- Atomic mass: ~20.18 (using the closest whole number)
- Neutrons = Atomic mass - Atomic number = 20 - 10 = 10 (rounding 20.18 to 20)
- Electrons = Number of protons = 10

### Completed Chart

| Element | # of Protons | # of Neutrons | # of Electrons |
|-----------|---------------|----------------|-----------------|
| Arsenic (As) | 33 | 42 | 33 |
| Boron (B) | 5 | 6 | 5 |
| Platinum (Pt) | 78 | 117 | 78 |
| Gold (Au) | 79 | 118 | 79 |
| Neon (Ne) | 10 | 10 | 10 |