Question

1. what is an electron?
2. how many electrons can be held in the:

1st shell:
2nd shell:
3rd shell:

Explanation:

An electron is a sub - atomic particle with a negative charge. It is one of the fundamental particles that make up an atom. The number of electrons in a shell is determined by the formula \(2n^{2}\), where \(n\) is the shell number.

For the 1st shell (\(n = 1\)):

$$2\times(1)^{2}=2$$

For the 2nd shell (\(n = 2\)):

$$2\times(2)^{2}=8$$

For the 3rd shell (\(n = 3\)):

$$2\times(3)^{2}=18$$

Answer:

1. An electron is a negatively - charged sub - atomic particle.

11.

• 1st shell: 2 electrons
• 2nd shell: 8 electrons
• 3rd shell: 18 electrons