Chemistry
State the element with the lowest electron affinity from the elements whose electronic configurations are below:
- 2, 8, 8
- 2, 7
- 2, 8, 6
- 2, 8, 7
Periodic Table
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Answer
2, 8, 8
Reason — The electronic configuration 2, 8, 8 is of argon, a nobel gas. Noble gas elements have completely filled outer-shell. Such electronic configurations are highly stable and as such noble gases find it difficult to accept electrons. Thus electron affinity of noble gas elements is zero.
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'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.
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Metallic element 'X' in period 3, having valency 2, reacts with a non-metallic element 'Y' of the same period also having valency 2. The number of non-metallic atoms in the compound formed between 'X' & 'Y' is:
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