Answer: With atomic number 20, calcium atoms have 20 positive protons, and the ion has only 18 electrons, which means the net charge is +2. Calcium ions are essential for muscle contractions, nerve impulses, and bone maintenance.
:
Answer:
18 electrons
Explanation:
thats because it loses two to become a cation
Electrons are the only parts of an atom that can make a chemical bond.
the sum of the atomic masses of the elements
12.0107 u
How to find it- Add up the mass of protons and neutrons
