Question

which element among lanthanides shiw +2 oxidation state and maximum number of unpaired electrons.​

Answer 1

Answer:

here's answer.

Explanation:

Praseodymium

• it show +2 oxidation state.
• nd have maximum number of unpaired electrons.

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Answer 2

The element among lanthanides show +2 oxidation state and maximum number of unpaired electrons.​

Explanation:

Periodic table

It is classification of elements according to periodicity in properties .

The elements are classified into following categories :

• Metals
• Non metals
• Transition metals
• Lanthanides and Actinides

Lanthanides

1. They are f-block  elements of period six in the periodic table.
2. Their characteristic features are :
3. Similarity in physical properties throughout the series
4. They mainly show   +3 oxidation state.
5. They normally form crystalline compounds.
6. They can also have an oxidation state of +2 or +4, though some lanthanides are most stable in the +3 oxidation state.
7. Another important feature of the Lanthanides is the Lanthanide Contraction,  which means the successive decrease in the radii of atom in series due to poor sheilding of 4f orbital because of its diffused shape .
8. Out of all,Europium (atomic number 63) has the electronic configuration [Xe] 4f⁷ 6s², it loses two electrons and  attains the highly stable, half-filled 4f⁷ configuration and hence it readily forms Eu²+ion.