Question

select the correct answer from each drop-down menu. an element has an atomic mass number of 16 and an atomic number of 7. the element has protons and neutrons.

Explanation:

Step1: Recall atomic number definition

Atomic number ($Z$) equals number of protons. Given $Z = 7$, so protons = 7.

Step2: Recall mass number formula

Mass number ($A$) = protons + neutrons. Given $A = 16$, protons = 7. So neutrons = $A - Z = 16 - 7 = 9$.

Answer:

The element has $\boldsymbol{7}$ protons and $\boldsymbol{9}$ neutrons.