The element rubidium, Rb, is immediately below potassium in the Periodic Table.
It reacts with bromine to form the compound rubidium bromide.
Which descriptions of this compound are correct?
1 )
type of bond: covalent / formula: RbBr / colour: brown
2 )
type of bond: covalent / formula: $RbB{r_2}$ / colour: white
type of bond: ionic / formula: RbBr / colour: white
4 )
type of bond: ionic / formula: $RbB{r_2}$ / colour: brown
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