Question

The value of $n$ in the molecular formula $B{e}_{n}A{l}_{2}S{i}_6{O}_{18}$ is ______

Answer 1

Answer: 3

$B{e}_{3}A{l}_{2}S{i}_6{O}_{18}$ (Beryl)
(according to charge balance in a molecule)
$2n+6+24-36=0$
$n=3$