An element X with electronic configuration 1s22s22p 63s 23p5combines with another element Y with the configuration 1s2s22p23s33p5. What is the formula of the compound formed?

An element X with electronic configuration 1s₂2s₂2p ₆3s ₂3p₅combines with another element Y with the configuration 1s2s₂2p₂3s₃3p₅. What is the formula of the compound formed?

A X₂Y₅
B X₂Y₃
C XY₃
D XY₂

waec 2003 chemistry

The correct answer is D. XY₂

No explanation given

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