Calculate the number of neutrons for the following atoms: 6 C13; 19 K41; 35 Br80 (Subtract atomic number from atomic mass)

The number of neutrons: ¹³C₆ = 7, ⁴¹K₁₉ = 22, ⁸⁰Br₃₅ = 45.

Explanation:

The mass number (A) of an atom is equal to the sum of the atomic number (Z) and the number of neutrons (N).

A = Z + N

Therefore, the number of neutrons, N = A - Z

1. C : A = 13 and Z = 6

The number of neutrons, N = A - Z = 13 - 6 = 7 neutrons

2. K : A = 41 and Z = 19

The number of neutrons, N = A - Z = 41 - 19 = 22 neutrons

3. Br : A = 80 and Z = 35

The number of neutrons, N = A - Z = 80 - 35 = 45 neutrons