A Se atom has a mass number of 76 . Determine the number of neutrons, protons, and electrons in this neutral isotope.

Answer 1

Hello, Olivia,

Se is number 34 on the periodic table, so it has 34 protons, by definition. Since it is neutral, it must also have 34 electrons. The total mass is the sum of protons (1 each) and neutrons (1 each):

34 + neutrons = 76

neutrons = 42

Neutrons: 42

Protons: 34

Electrons: 34

Bob