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:

B. NaBr