In: Chemistry
1)
Aluminum and oxygen
Al forms Al3+ ion
O form O2- ions
the compound will be Al2O3
2)
Beryllium and iodine
Be forms Be2+ ion
I form I- ions
the compound will be BeI2
3)
Calcium and sulfur
Ca forms Ca2+ ion
S form S2- ions
the compound will be CaS
4)
Calcium and iodine
Ca forms Ca2+ ion
I form I- ions
the compound will be CaI2