# What is the chemical formula for ammonium tetraborate?

${\left(N {H}_{4}\right)}_{2} {B}_{4} {O}_{7}$
${\left(N {H}_{4}\right)}_{2} {B}_{4} {O}_{7}$
Ion tetraboric is${B}_{4} {O}_{7}^{2 -}$ since B have oxidation number = +3 and O =-2
ammonium is $N {H}_{4}^{+}$