This is the lead tribromide.
Ethylbromide is the name of the compound CH3-CH2-Br.
Formula: Pb3(PO3)2
Magnesium Bromide
If this really is a compound, it is named "magnesium bromide hydroxide".
Mixed salt: magnesium hydroxi-bromide
The formula for the compound lead(II) phosphate is Pb3(PO4)2
Ethylbromide is the name of the compound CH3-CH2-Br.
Silver Bromide
Pb3(PO4)2
Formula: Pb3(PO3)2
Formula: Pb3(PO3)2
Sodium Bromide
Magnesium Bromide
Pb3(PO)4 would be the correct answer but it isn't because this compound does NOT exsist: Pb3(PO4)4 or Pb3(PO3)4 are possible phosphate and phosphite salt of Pb(4+) ions.
If this really is a compound, it is named "magnesium bromide hydroxide".
Mixed salt: magnesium hydroxi-bromide
KBr2 does NOT exist, bromide (being Br-) has a valency of (minus) one, so the only possibility is KBr, potassium bromide, in solution as ions: K+ and Br-