Question

what is the formula for the ionic compound of sodium and bromine? na is in group 1 and br is in group 7a or 17. nabr₂ nabr nabr₃ na₃br

Explanation:

Step1: Determine ion charges

Sodium (Na) in group 1 forms a $Na^{+}$ ion with a +1 charge. Bromine (Br) in group 17 forms a $Br^{-}$ ion with a - 1 charge.

Step2: Balance charges

To form a neutral ionic - compound, the charges must balance. Since the charges of $Na^{+}$ and $Br^{-}$ are equal in magnitude but opposite in sign, one $Na^{+}$ ion combines with one $Br^{-}$ ion.

Answer:

NaBr