Question

In the nucleus of an Adam there are 18 protons and 20 neutrons what are the atomic number and mass number of this isotope

Answer 1

Atomic number = 18 (Number of protons) 
Mass number = 18 + 20 (Number of protons + neutrons)

Answer 2

Answer:

The atomic number this isotope is 18.

The atomic mass this isotope is 38.

Explanation:

Atomic number(Z) = Total numbers of protons

Mass number (A) = Total number of protons(Z) + Total number of neutrons(N)

A = Z + N

We have :

Number of protons in a nucleus of a given atom of an isotope, Z= 18

Number of neutrons in a nucleus of a given atom of an isotope, N= 20

A = Z + N = 18 + 20 = 38

The atomic number this isotope is 18.

The mass number  this isotope is 38.