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Classification of Elements and Periodicity in Properties
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26/08/2021 12:10 pm
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The electronic configuration of an element is 1s2,2s2,2p6,3s23p3. The atomic number and the group number of the element ‘X’ which is just below the above element in the periodic table are respectively
(a) 23 and 5
(b) 23 and 15
(c) 33 and 15
(d) 33 and 5
1 Answer
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26/08/2021 12:11 pm
Correct answer: (c) 33 and 15
Explanation:
Atomic number of the given element = 15 ; atomic number of element ‘X’ will be 18 + 15 = 33;
group no. of ‘X’ = 10 + 5 (valence electrons) = 15, period = 4th