The atomic number of potassium is 19. Hence the number of electrons in N shell will be

• (A) 9
• (B) 1
• (C) 8
• (D) 2

The atomic number of potassium (K) is 19, which means it has 19 electrons. These electrons are arranged in different energy levels or shells around the nucleus. The distribution of electrons in these shells follows a specific pattern.

Electron Configuration of Potassium

For potassium, the electron configuration can be broken down as follows:

• First shell (K shell): 2 electrons
• Second shell (L shell): 8 electrons
• Third shell (M shell): 9 electrons

Focus on the N Shell

The N shell corresponds to the fourth energy level. However, in potassium, the electrons fill the lower energy levels first. Therefore, the N shell does not have any electrons in this case.

Answer to the Question

Since the N shell has no electrons in potassium, the correct answer is:

(B) 1