The net charge on a sulfide ion (S2-) is -2. Explain how this ion obtains its
charge. Your answer
should include a discussion of
subatomic particles.

Explanation:

A sulfide ion S²⁻ is formed from sulfur atom.

An ion is an atom that has lost or gained electron.

Sulfur atom is made up of 16 electrons according to its position on the periodic table.

In essence, there are 16 negatively charged particles in an atom of sulfur.

Also, in the neutral or uncharged state, the number of electrons equals to the number of protons.

So, there are 16 electrons and protons in an atom of sulfur.

 Charge  = Number of protons  - Number of electrons

 Charge  = 16  - 18  = -2

the answer for sodium is 0.186

the answer for rubidium is 0.251