A Ca atom has a mass number of 40. How many neutrons does it have?

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In nuclear chemistry and isotopes, the mass number A is the total number of nucleons, which equals the sum of protons (Z) and neutrons (N): A = Z + N.
Calcium (Ca) has atomic number Z = 20, meaning it has 20 protons.
Given the mass number A = 40, we can solve for neutrons: N = A − Z = 40 − 20 = 20.
Therefore, the atom has 20 neutrons. Note that this uses standard isotope notation where 40 is the mass number and 20 is the number of protons; the presence or absence of answer options does not affect the basic relationship A = Z + N.

CHEM1011 (ND) Lecture quiz: Week 1

A Ca atom has a mass number of 40. How many neutrons does it have?

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