I'm completely lost on this how do i find the formula or name for each ionic compound?

The names or formulas are below, just look for the the names or symbols in the tables, write them and cross the powers without the signs.

Explanation:

Ammonium sulfide         (NH₄)₂S

Iron III chloride                FeCl₃

Aluminum Nitrate

Barium acetate               Ba(C₂H₃O₂)₂

Calcium bromide

Sodium nitrate

Lithium oxide               Li₂O

Copper II bromide       CuBr₂

Calcium hydroxide

Ammonium phosphate

Magnesium nitrate

Strontium nitrate          Sr(NO₃)₂

Silver sulfide                 Ag₂S

Cobalt III hydroxide      Co(OH)₃

Copper II chloride

Potassium sulfide

Iron III sulfate

Mg₃(PO₄)₂

Sn(NO₃)₄

Sodium phosphate

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.