How many protons, neutrons and electrons are in calcium?

The element calcium (Ca) has an atomic number of 20, which means it has 20 protons in its nucleus. The number of protons in an element determines its identity.

The most common and stable isotope of calcium is ^40Ca, which has 20 neutrons. However, calcium can have other isotopes with different numbers of neutrons.

Since calcium is a neutral atom, it has an equal number of electrons as protons. Therefore, it also has 20 electrons.

So, in summary, calcium has:

20 protons
20 neutrons (in the most common isotope, ^40Ca)
20 electrons