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Chemistry, 18.03.2021 17:40 hany90

Observe the given table and answer the following ques Element
Electronic configuration
А
1s 2s 2p
- 7
B
1s 2s 2p 3s
С C
1s 2s 2p 3s 3pº 4s
a) What is the valency of 'A' and why?
b) Which elemetn is more active in between B and C, why?
c) In which block and group does element A lie.

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