Four elements A, B, C and D along with their electronic configuration are given below :
Four elements A, B, C and D along with their electronic configuration are given below :
| Elements | A | B | C | D |
| Electronic configuration | 2,1 | 2,8 | 2,8,1 | 2,8,8 |
Now answer the following questions :
(i) which two elements belong to the same period ?
(ii) Which two elements belong to the same group ?
(iii) Which element out of A and C is more reactive and why?
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(i) A and B, C and D have the same period.
(ii) A and C have one valence electron, so the same group.
(iii) C is more reactive because C is placed below A in the periodic table and reactivity increases down the group.
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