The atoms A and B have electronic configuration (2, 8, 3) and (2, 7) respectively. 2M
i) To which periods, do A and B belong?
ii) To which groups, do A and B belong
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Answer:
A belongs to period 3 and B belongs to period 2
A belongs to gruop 3 and B belongs to group 7
Explanation:
A is Aluminium and B is flourine
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