Questions with help 3 answer
MgCl2 (the atomic numbers are 12 and 17 respectively)
Mg has configuration 2,8,2 and so loses two electrons to form 2,8,0 Mg2+
Cl has configuration 2,8,7 and so gains one electron to form 2,8,8 Cl-
One 2+ ion needs two 1- ions to balance the charge and so the formula for the compound is MgCl2.
Na2S (the atomic numbers are 11 and 16 respectively)
Na has configuration 2,8,1 and so loses one electron to form 2,8,0 Na+
S has configuration 2,8,6 and so gains two electrons to form 2,8,8 S2-
Two 1+ ions need one 2- ion to balance the charge and so the formula for the compound is Na2S.
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