The atomic mass of an element whose atoms consist of seven protons, eight neutrons, and seven electrons is
a. 7
b. 14
c. 15
d. 22

The atomic mass is C. 15

Atomic mass = P + N = 7+8 = 15

The atomic mass of an element is defined as the sum of the protons and neutrons. On the other hand, the atomic number of a neutral element is equivalent to the number of protons or electrons. This is because a neutral element should have equal number of protons and electrons.