Question

Copper (Z=29) has same number of unpaired electrons as 

(a) Scandium (Z = 21)

(b) Manganese (Z = 25)

(c) Chromium (Z = 24)

(d) Titanium (Z = 22)

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Answer 1

Answer:

Copper (Cu) with a configuration of 4s1 3d10 has 1 unpaired electron.

so scandium has 1 unpaired electron 4s2 3d1

Mn - 4s2 3d5 5 unpaired electron

Cr- 4s1 3d5 6 unpaired Electron

Ti -4s2 3d2 2 unpaired Electron

answer (a) Scandium is correct......

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Answer 2

Given:

The element copper(Z=29)

To find:

The element having same number of unpaired electrons as copper

Explanation:

The electronic configuration of copper(z=29) is 1s²2s²2p⁶3s²3p⁶3d¹⁰4s¹

In the 4s sub-shell there is only 1 electron and all the remaining electrons are paired. Therefore the number of unpaired electrons in copper is 1

a) Scandium (Z = 21)

The electronic configuration of scandium (Z=21) is 1s²2s²2p⁶3s²3p⁶3d¹4s2

There is only 1 electron in 3d sub-shell which is unpaired

b) Manganese (Z = 25)

The electronic configuration of manganese (Z=25) is 1s²2s²2p⁶3s²3p⁶3d⁵4s²

There are 5 electrons in 3d sub-shell which are unpaired

c) Chromium(Z = 24)

The electronic configuration of chromium (Z=24) is 1s²2s²2p⁶3s²3p⁶3d⁵4s¹

There are 5 electrons in 3d sub-shell and 1 electron in 4s subshell which are unpaired. The total number of unpaired electrons is 6

d) Titanium (Z = 22)

The electronic configuration of Titanium (Z=22) is 1s²2s²2p⁶3s²3p⁶3d²4s2

There are 2 electrons in 3d sub-shell which are unpaired

Scandium (Z=21) has same number of unpaired electrons as Copper ( Z=21)