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Question

Chemistry Question on d block elements

An element has 2 electrons in its K-shell, 8 electrons in L-shell, 13 electrons in M-shell and one electron in N-shell. The element is:

A

Cr

B

Fe

C

V

D

Ti

Answer

Cr

Explanation

Solution

According to question an element contains : 2 electrons in K shell 8 electrons in L shell 13 electrons in M shell and 1 electron in N shell Total electrons = 2 + 8 + 13 + 1 = 24 So, the atomic number of element is = 24. The element whose atomic number is 24 is chromium. Its electronic configuration : 1s2⏟K,2s6,2p6⏟L,3s2,3p6,3d5⏟M,4s1⏟N\underbrace{1{{s}^{2}}}_{K},\underbrace{2{{s}^{6}},2{{p}^{6}}}_{L},\underbrace{3{{s}^{2}},3{{p}^{6}},3{{d}^{5}}}_{M},\underbrace{4{{s}^{1}}}_{N}