Calcium has 20 neutrons and is found in your teeth.
Calcium is the answer. Atomic weight 40 - with 20 protons means 20 neutrons. Calcium is a key element in teeth and bones.
calcium
You are calcium. Most calcium atoms have 20 neutrons though 20 - 28 is possible, but it is the fact that they have 20 protons which makes them calcium.
Calcium
Calcium has 20 protons, 20 electrons and 20 neutrons in its most commonly found isotope.
There are 18, 20 or 22 neutrons.
20 teeth
This element is calcium.
20
20
20
calcium