The atomic number of chromium is 24. Its electronic configuration in ground state is 1s $^{2}$ 2s $^{2}$ 2p $^{6}$ 3s $^{2}$ 3p $^{6}$ 4s $^{1}$ 3d $^{5}$ . Chromium atom by losing 3 electrons form Cr $^{3 +}$ ions. A chromium atom contains 17% more neutron than the protons. Now answer the following questions
The number of unpaired electrons in Cr $^{3 +}$ ions is :

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Solution

The correct option is A 3
From electronic configuration, it can be seen that
1s $^{2}$ , 2s $^{2}$ 2p $^{6}$ 3s $^{2}$ 3p $^{6}$ 4s $^{0}$ 3d $^{3}$ .
Three electrons in 3d sub-shell are unpaired

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The atomic number of chromium is 24 Its electronic configuration in the ground state in $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 4 s^{1}, 3 d^{5} .$ Chromium atom by using 3 electrons from Cr⁺³. A chromium atom contains 17% more neutrons than a proton. Now answer the following questions.

The number of unpaired electrons present in the 3d subshell in Cr⁺³ ion is:

Q. Match the following species with their corresponding ground state electronic configuration.

	Atom / Ion		Electronic configuration
A	Cu	(i)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$
B	$C u^{2 +}$	(ii)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2}$
C	$Z n^{2 +}$	(iii)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{1}$
D	$C r^{+ 3}$	(iv)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9}$
		(v)	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$

Q. The element with electronic configuration of its atom

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 3 d^{10}, 4 s^{1}

is:

Q. If an atom has electronic configuration

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}

, it will be placed in:

Q. I: An element that has the electron configuration

{1 s}^{2} {2 s}^{2} {2 p}^{6} {3 s}^{2} {3 p}^{6} {3 d}^{3} {4 s}^{2}

is a transition element.
II: In atoms of transition elements, the 1s, 2s, 2p, 3s and 3p orbitals are completely filled in the ground state.

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The correct option is A 3From electronic configuration, it can be seen that1s2, 2s2 2p6 3s2 3p6 4s0 3d3.Three electrons in 3d sub-shell are unpaired

The correct option is A 3
From electronic configuration, it can be seen that
1s $^{2}$ , 2s $^{2}$ 2p $^{6}$ 3s $^{2}$ 3p $^{6}$ 4s $^{0}$ 3d $^{3}$ .
Three electrons in 3d sub-shell are unpaired