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08/10/2021 7:32 pm
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The atomic numbers of three elements A, B and C are given below:
Element Atomic number
A - 5
B - 7
C - 10
(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
1 Answer
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08/10/2021 7:33 pm
(i) C (2, 8).
(ii) B (2, 5).
(iii) A (2, 3).
(iv) 2nd period (2 shells are filled).