Question

1. write the number of protons, neutrons, and electrons for cl - 37. *

a. 17 p, 20 n, 17 e
b. 17 p, 20 n, 18 e
c. 18 p, 19 n, 17 e
d. 17 p, 37 n, 17 e

Explanation:

Step1: Recall chlorine's atomic number

Chlorine (Cl) has atomic number 17. Atomic number = number of protons. So number of protons (p) = 17.

Step2: Calculate number of neutrons

The mass - number of Cl - 37 is 37. Mass number = number of protons+number of neutrons. So number of neutrons (n)=37 - 17=20.

Step3: Determine number of electrons

For a neutral atom, number of electrons (e) = number of protons. Cl - 37 is a neutral isotope, so number of electrons = 17.

Answer:

A. 17 p, 20 n, 17 e