Question

Determine the number of protons in an isotope with the atomic number 19 and the mass number of 41.

A) 19 protons
B) 20 protons
C) 21 protons
D) 41 protons

Answer 1

The number of protons in an isotope with the atomic number 19 and the mass number 41 is 19.

Step-by-step explanation:

The number of protons in an isotope is equal to the atomic number. In this case, the atomic number is 19, so the number of protons is 19. The mass number, 41, is the sum of the protons and neutrons.

To find the number of neutrons, subtract the number of protons from the mass number. So, the number of protons in this isotope is 19.