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Q.

The electronic configuration of an element 'X', is 1s2 2s2 2p6 3s2 3p3. What is the atomic number of the element which is just below 'X' in the periodic table

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a

34

b

33

c

49

d

31

answer is A.

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Detailed Solution

detailed_solution_thumbnail

The electronic configuration of an element below 'X' = 1s2 2s2 2p6 3s2 3p63d104s24p3.

Hence, The atomic number of the element = 33

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The electronic configuration of an element 'X', is 1s2 2s2 2p6 3s2 3p3. What is the atomic number of the element which is just below 'X' in the periodic table