Explanation:
First I'm going to draw the structure of the neutral calcium atom and the structure of the chlorine atom.
Now I'm going to draw only the valence shells of ions that participate in ionic bonding:
So Ca2+ will donate 2 electrons for both 2 atoms of Chlorine, forming CaCl2.
Density = mass/volume
Density =12.5/16=0.78125 g/cm^3
1) RbF- rubidium fluoride
Rubidium fluoride is salt with ionic bond.
Rubidium is a cation which should be named first and followed by fluorine which is an anion.
2) CuO- copper(II) oxide
CuO is oxide which first goes name of metal and its oxidation state (+2 - II) at the end oxide.
3) (NH₄)₂C₂O₄- ammonium oxalate.
This is a salt compound and ammonium (NH₄⁺) is cation and the chemical formula for oxalate is C₂O₄^-2
