Question

what is the atomic number of this atom?

Explanation:

Step1: Recall atomic number definition

The atomic number is the number of protons in an atom.

Step2: Identify element

The element shown is Lithium (\(Li\)).

Step3: Look up atomic number

From the periodic table, Lithium (\(Li\)) has an atomic number of \(3\).

Answer:

\(3\)