Someone can please describe what happens to the valence electrons when two elements form an ionic compound?

ionic bond / electrovalent bond.

electrostatic attractions between oppositely charged ions .

eg: NaCl.

Na - 2, 8 ,1 Na^+ 2, 8

Cl - 2, 8 ,7 Cl^- 2 , 8, 8

Na^+ + Cl^- gives Na^+Cl^-

sodium loses one electron to attain nearest noble gas configuration.

Chlorine gain one electron from sodium to attain nearest noble gas configuration .

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.