Question

A certain element is a clear, stable gas at room temperature. An atom of this element has 7 protons, 7 electrons, and a mass number of 15. How many neutrons are in this atom?

Answer 1

Number of neutrons = 8

Further explanation

Given

7 protons, 7 electrons, and a mass number of 15.

Required

Number of neutrons

Solution

Within the atom there are subparticles, namely protons, neutrons and electrons

Protons and neutrons are present in the atomic nucleus, while electrons surround the atomic nucleus in the atomic shell

Atomic number = number of protons = number of electrons

Mass number= number of protons + number of neutrons

15 = 7 + number of neutrons

number of neutrons = 8