Question

Identify the atomic number of each of the fol­lowing atoms: Potassium (p$=19$, n$=20$)

Answer 1

Atomic number:

1. Atomic number is equal to the number of protons or the number of electrons present in an atom of the element.
2. For example, the atomic number of carbon is $6$ and it contains $6$ protons in its nucleus and $6$ electrons in its shells.

Identify the atomic number of potassium:

1. In potassium, number of protons is equal to $19$.
2. Hence, the atomic number of potassium is $19$.