Two atoms A and B have the electronic configuration given below:(x) IS22S12P63S1 (y) IS2 2S22P5 Which of the following compounds are they likely to form?
Correct answer: A. Xy
- A. Xy
- B. Xy2
- C. X1y
- D. Xy3
Explanation
The valence shell configuration of x indicates that it belongs to group I-A (the alkali metals) while the valence configuration of y indicates that it is a halogen (group VII-A). The former has a valency of 1+ wile the latter has a valency of 1-. Hence the formula of this compound should be Xy.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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