What will the ratio of ions be in any compound formed from a group 1a metal and a group 1a nonmetal?

The ratio will be 1:1. When they react chemically with one another, the group 1A metals (the alkali metals) give up one electron, forming ions with a charge of 1+, and the group 7A (17) halogens gain the electron given up by the metal, forming ions with a 1- charge. When they react chemically with one another, they form a neutral ionic compound with a ratio of 1alkali metal:1halogen.

Na+ + Cl- --> NaCl

Li+ + Br- --> LiBr

K+ + F- --> KF