Se conocen dos isótopos del elemento cloro:
35
17Cl y 37
17Cl, que existen en la naturaleza
en la proporción 3 a 1. Calcula la masa
atómica del cloro.

The answer is letter c

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic