# How many protons, neutrons and electrons are in calcium?

Jul 4, 2017

20, 20, 20

#### Explanation:

Assuming that we are referring to a stable atom of calcium, we need to find the atomic number of calcium. This can be memorized, or found on the periodic table.

Calcium is the 20th element, with 20 protons (since the number of protons directly changes the element itself).

Since a stable atom has a net charge of $0$, we must have 20 electrons.

The number of neutrons will be the same as the number of protons, or else we will have an isotope, in this case, it is also 20.