Chemistry
'ACl2' is the formula of an electrovalent solid. 'A' is likely to be in the same group in period 3, as the element given below present in period 2.
- Be
- Li
- C
- B
Periodic Table
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Answer
Be
Reason — A is in period 3. The formula ACl2 suggests that A has a valency of +2, so, A is a metal that forms A2+ ions.
In Period 3, the element with valency 2 is Magnesium (Mg), it forms MgCl2, an ionic solid.
∴ Be (Beryllium) is in Group 2, period 2, the same group as Mg. Be and Mg both form +2 ions, and their chlorides have the formula ACl2.
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