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An element ‘Y’ has one valence electron. An element ‘X’ has seven valence electrons.The formula of the compound formed between them is best represented by

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a

XY

b

X+Y-

c

YX

d

Y+X-

answer is D.

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Detailed Solution

An element ‘Y’ has one valence electron….. …..It forms Y+ by losing an electron.An element ‘X’ has seven valence electrons……It forms X- by gaining an electron.Thus the formula of the ionic compound formed between them is best represented by Y+X-.

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An element ‘Y’ has one valence electron. An element ‘X’ has seven valence electrons.The formula of the compound formed between them is best represented by