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The atomic number of an element A is 40. What are the group number, period and block of the element?

Asked by Topperlearning User 27th June 2016, 11:01 AM
Answered by Expert

The electronic configuration of the element with atomic number 40 is:

40X: 1s2, 2s2, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d2
Since the last electron enters d sub shell, the element belongs to d- block.
Since the outermost shell of the element is fifth, the element belongs to period 5
Group number of the elements of d-block is equal to sum of the electrons in outermost s-sub shell and d-sub shell of penultimate shell.
Hence, group number of the element = 2 + 2 = 4. 
Answered by Expert 27th June 2016, 1:01 PM
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