Answer:
RbBr
Step-by-step explanation:
Chemical equation:
Rb + Br₂ → RbBr
Balanced chemical equation:
2Rb + Br₂ → 2RbBr
Rubidium is alkali metal. It is present in group one. It has one valance electron.
When it combine with halogen it form salt. Rubidium lose its one valance electron which is accepted by bromine. In this way both gain the complete octet and both atoms combine through electrostatic attraction and form ionic compound rubidium bromide.
Ionic compound:
It is the compound which is formed by the transfer of electron from one atom to the atom of another element.
Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.