How many neutrons are in a calcium atom?

univerkov | January 8, 2021 | education

The number of neutrons in a calcium atom depends on the isotope. The number of neutrons can be found using the formula: Number of neutrons = mass number – atomic number.
Calcium: mass number = 40.08 ⇒ 40. Atomic number = 20.
The number of calcium atoms is 20, which means that all calcium atoms have 20 protons in their nuclei. However, the number of neutrons in the nuclei of calcium atoms can vary. Isotopes are atoms of the same element with different numbers of neutrons.
There are many isotopes of calcium, from calcium-40 to 20 neutrons, to calcium-48 with 28 neutrons.

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