Make formulas of binary compounds of nitrogen, oxygen, fluorine with calcium.

Binary compounds are substances whose molecules consist of atoms of two elements. In such compounds, the more electronegative element takes up as many electrons as it lacks before the end of the energy level and charges negatively, and the more electropositive element gives up electrons to the outer energy level.
In this case, calcium will give 2 electrons: calcium nitride – Ca3N2, calcium oxide – CaO, calcium fluoride – CaF2.