Question

an atom of the element zinc has an atomic number of 30 and a mass number of 65. how many protons does an uncharged zinc atom have?
○ 30
○ 35
○ 65
○ 95

Explanation:

Step1: Recall atomic number definition

Atomic number ($Z$) is equal to the number of protons in an atom's nucleus. For a neutral atom, it also equals the number of electrons, but here we focus on protons.

Step2: Apply to zinc atom

The zinc atom has an atomic number of 30. By the definition of atomic number, the number of protons is equal to the atomic number. So, the number of protons in an uncharged zinc atom is 30.

Answer:

A. 30