Sodium has a valency of 1 because it donates 1 electron to achieve a stable octet configuration, forming a +1 ion. Chlorine has a valency of 1 because it gains 1 electron to achieve a stable octet configuration, forming a -1 ion. When they combine in a 1:1 ratio to form sodium chloride, the compound is electrically neutral.
CaCl2 (Calcium has a valence of 2; Chlorine is1(one)
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Pardon me but what is an Is1?
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