Calcium is the answer. Atomic weight 40 - with 20 protons means 20 neutrons. Calcium is a key element in teeth and bones.
Number of neutrons = mass number - atomic number = 40 - 20 = 20 neutrons
A calcium atom typically has 20 protons, 20 electrons, and approximately 20 neutrons.
Calcium-45 has 20 protons (since it is calcium) and therefore, it has 25 neutrons, as the atomic number (number of protons) subtracted from the mass number (protons + neutrons) gives the number of neutrons.
Electrons have no relevant mass, and protons and neutrons both have the mass of 1u. If Calcium has the number 20, it has 20 protons (and electrons). It's mass is about 40u. Core Mass - Protons = Neutrons 40u - 20u = 20u, this means Calcium has 20 electrons, 20 protons and 20 neutrons.
20F, I think this means that it is an isomer of F with an atomic mass of 20. Based Flourine has an atomic mass of 18. So taking this into account the isomer should have the same number of protons but different number of neutrons. 20-9= 11. 20F has 11 neutrons
calcium
Calcium has 20 neutrons and is found in your teeth.
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
This element is calcium.
calcium
Calcium
Calcium (Ca)
Calcium has 20 protons, 20 electrons and 20 neutrons in its most commonly found isotope.
There are 18, 20 or 22 neutrons.
20 teeth
20