Question

a)From the given subshell electronic configuration, write the correct electronic configuration of chromium.
24Cr1s² 2s² 2p 3s² 3p 3d 4s²
24 Cr-1s² 2s² 2p 3s² 3p 3d5 4s¹
b. What is the reason for this selection?​

Answer 1

Answer:

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 :

Easy

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Answer

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

Answer 2

because the atomic number of chromium is 24