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Elements with configuration 2, 8, 2 and 2, 7 are placed in modern periodic table. Find out:1. the valency of the elements mentioned above.2. the period and group of the above elements.

Answer» Elements with configuration 2, 8, 2 and 2, 7 are placed in modern periodic table. Find out:

1. the valency of the elements mentioned above.

2. the period and group of the above elements.




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