3
Two
Add the electrons in accordance with the aufbau principle and then count the unpaired ones.
Zero. It has 4 electrons and thus it's electron configuration is 1s2 2s2. Each s orbital can only hold 2 electrons and since each has 2, there are are no unpaired electrons.
There is 1 unpaired electron in Copper (Cu)
There are no unpaired electrons in strontium.
3
3
5 unpaired electrons There are 5 unpaired electrons in the Fe3+ ion. The reason for this is that Iron has the electron configuration Ar3d5.
Two
Add the electrons in accordance with the aufbau principle and then count the unpaired ones.
Technetium has 43 protons and electrons.
Mn is configured: [Ar] 4s2 3d5 , soMn2+ has an electron configuration of: [Ar] 4s0 3d5It looks like that 5 or 3 or (at least) 1 (one) electrons are to be unpaired.
Zero. It has 4 electrons and thus it's electron configuration is 1s2 2s2. Each s orbital can only hold 2 electrons and since each has 2, there are are no unpaired electrons.
There is 1 unpaired electron in Copper (Cu)
By determining the element's orbital diagram, or its electron configuration.
There are 4 unpaired electrons in the ground state electron configuration of an Fe atom. These 4 unpaired electrons are in the 3d subshell.
An atom of yttrium (Y) has an electron configuration of 1s2,2s2,2p6,3s2,3p6,4s2,3d1, so it has one unpaired electron in the 'd' orbital.