Question

who is it? tell what element.

Explanation:

Step1: Recall the atomic number definition

The atomic number \(Z\) is equal to the number of protons (\(P\)).

Step2: Identify elements using atomic numbers

• For \(P = 4\): The element with atomic number \(4\) is Beryllium (\(Be\)).
• For \(P = 13\): The element with atomic number \(13\) is Aluminium (\(Al\)).
• For \(P = 26\): The element with atomic number \(26\) is Iron (\(Fe\)).

Answer:

Beryllium (\(Be\)), Aluminium (\(Al\)), Iron (\(Fe\))