Question

which element has 16 neutrons, 15 protons, and 15 electrons?
a gallum
b phosphorus
c zinc
d sulfur

Explanation:

Step1: Recall the atomic number concept

The atomic number ($Z$) of an element is equal to the number of protons. Given the number of protons is 15.

Step2: Identify the element

Looking at the periodic table, the element with atomic number $Z = 15$ is phosphorus ($P$).

Answer:

B. Phosphorus