Question

why is the valency of chlorine -1 in Nacl
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Answer 1

Answer:

Cl-

Explanation:

you mean what in the place of why

Answer 2

Answer:

They have seven electrons in their valence shell so react readily with metals that will give up electrons to form an ionic bond. ... Because of it's highly reactive nature chlorine is often found bound to other elements such as sodium (in rock salt, NaCl, see below).