Question

An element X belong to 4th period and 17th group, state.

Write the formula of the compound formed when it reacts with `(27)/(13) y `

Answer 1

(iv) The element  `(27)/(13) y ` has three electrons in its outermost shell which it can donate; hence, its valency is three. While the valency of bromine is
1. Thus,  `(27)/(13) y `  can donate three electrons, and bromine can accept 1 electron to get the stable electronic configuration.
Therefore, the formula of the compound is AlBr3