Question

The atomic mass of an element whose atoms consist of seven protons, eight neutrons, and seven electrons is .

Answer 1

15u. This is because all the atomic mass of an element comes from the nucleus, and the nucleus has protons and neutrons

7+8=15

Answer 2

Answer: The correct answer is - Atomic mass - 15

Atomic mass of an element can be defined as sum of total number of protons and neutrons present in an atom. As it is given that there are seven protons and seven electrons, therefore this atom is neutral. Mass number can be mathematically calculated as-

Mass number = number of protons + number of neutrons

 Number of protons = 7

 Number of neutrons = 8

Putting these values in the formula-

Thus, atomic mass = 7+ 8 = 15