Question

What is the compound formula for Ba2 and NO3–?

Answer 1

That would be the compound Ba(NO3)2. The Barium ion has a charge of 2+ so there are 2 NO3- ions in the formula to produce a neutral compound.

Answer 2

Answer: The chemical compound formed by the combination of given ions is $Ba(NO_3)_2$

Explanation:

Barium is the 56th element of periodic table having electronic configuration of $[Xe]6s^2$.

To form $Ba^{2+}$ ion, this element will loose 2 electrons.

Nitrate ion is a polyatomic ion having chemical formula of $NO_3^{-}$

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

So, the chemical compound formed by the combination of given ions is $Ba(NO_3)_2$

The formed compound is an ionic compound.