Waiting for answer This question has not been answered yet. You can hire a professional tutor to get the answer.

QUESTION

# The element calcium has the atomic number of 20 and the mass number of 40, how many neutrons does it have?

An atom of the calcium-40 isotope has 20 neutrons in its nucleus.

are named for their mass numbers, for example, carbon-14. The of an isotope is the sum of the number of protons and neutrons in the atomic nucleus. The is the number of protons.

The calcium-40 isotope has a mass number of 40, and an atomic number of 20, therefore it has 20 protons.

"Number of neutrons"="(mass number)"-"(atomic number)"

"Number of neutrons"=40-20=20