Rank these transition metal ions in order of decreasing number of unpaired electrons. If two ions have the same number of unpaired electrons Fe^3 , Mn^4+ , V3+ , Ni^2+ , Cu^+

> = >

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

Fe: 26:

: 5 unpaired electrons

Mn: 25:

: 3 unpaired electrons

V: 23:

: 2 unpaired electrons

Ni : 28 :

: 2 unpiared electrons

Cu : 29 :

: 0 unpaired electrons

Thus the order of decreasing number of unpaired electrons:

> = >

gas and precipitate r the correct answers