How do you predict the correct formula for the combination reaction between a nonmetal and a group a metal?

Refer to the Periodic Table.

Explanation:

To predict the correct formula for the combination reaction between a nonmetal and a metal group, you can simply refer to the Periodic Table and check what formula does it have for any particular element.

The Periodic Table has both the metal and non-metal group with their atomic masses and other characteristics. Looks for the formula of each element in the compound and add the number of molecules according to the chemical equation.

c. the scientist provides unbiased information to the government.