Question

5
B
Boron
10.81

Atomic number
atomic mass
# of protons
# of neutrons
# of electrons

Answer 1

To calculate the atomic properties of Boron (B) based on the information you provided, we can fill in the details as follows:

- **Atomic number**: 5 (This is the number of protons in the nucleus of an atom of Boron.)
- **Atomic mass**: 10.81 (This is the average mass of an atom of Boron, accounting for the natural isotopic distribution.)
- **Number of protons**: 5 (This is equal to the atomic number.)
- **Number of neutrons**:
- To calculate the number of neutrons, we can use the formula:
\[
\text{Number of neutrons} = \text{Atomic mass} - \text{Number of protons}
\]
Given that the atomic mass is approximately 10.81 and there are 5 protons:
\[
\text{Number of neutrons} \approx 10.81 - 5 = 5.81 \text{ (round to the nearest integer, which is 6)}
\]
- So, the number of neutrons is approximately 6.

- **Number of electrons**: 5 (In a neutral atom, the number of electrons equals the number of protons.)

Here’s the summary:

- Atomic number: 5
- Atomic mass: 10.81
- Number of protons: 5
- Number of neutrons: 6
- Number of electrons: 5