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Bihar Police Constable Model Paper 7
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© examsnet.com
Question : 21
Total: 100
Which non-metal element has a electronic configuration of 2, 8, 7?
Oxygen
Chlorine
Nitrogen
Carbon
Validate
Solution:
There are 3 shells of electrons so the element is in period 3, and the last shell has 7 electrons.
So Chlorine is in Group (17 or VIIA).
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