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Using the information from the Periodic Table of Elements, what are the correct numbers of subatomic particles for an atom of calcium?

Calcium - Energy Education

a
An atom of calcium would have 40 electrons, 40 protons, and 40 neutrons.
b
An atom of calcium would have 20 electrons, 20 protons, and 20 neutrons.
c
An atom of calcium would have 20 electrons, 40 protons, and 20 neutrons.
d
An atom of calcium would have 40 electrons, 40 protons, and 20 neutrons.

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Answered by GPT-5 mini AI
Answer: b

Explanation: Calcium has atomic number 20, so a neutral atom has 20 protons and 20 electrons. Its common mass number is about 40, so neutrons ≈ 40 − 20 = 20.