Chemistry
An element Y has 2 electrons in the 2nd orbit and X has 7 electrons in its 3rd orbit. The compound formed between them has the formula:
- XY2
- YX2
- YX
- Y7X2
Answer
XY2
Reason — Element Y has 2 electrons in its 2nd orbit, so it's electronic configuration of Y is [2, 2] and Element X has 7 electrons in the third orbit so its electronic configuration is [2, 8, 7]
Y donates its two valence electrons and two atoms of X accept one electron each to attain stable octets. Hence, the compound formed is YX2.
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