Question

1. if you have a sample of atoms and each atom has 12 protons in its nucleus, which element do you have?

Explanation:

Step1: Recall element - proton relationship

The atomic number of an element is equal to the number of protons in the nucleus of its atom.

Step2: Identify the element

Looking at the periodic - table, the element with an atomic number of 12 is magnesium.

Answer:

Magnesium