Question

Which is not correct statement about the chemistry of $3d$ and $4f$ series elements?

• A. $3d$ elements show more oxidation states than $4f$-series elements
• B. The energy difference between $3d$ and $4s$ orbitals is very little
• C. Europium(II) is ore stable than $Ce\left(II\right)$
• D. The paramagnetic character in $3d$-series elements increases from scandium to copper

Answer 1

The correct option is D The paramagnetic character in $3d$-series elements increases from scandium to copper

Paramagnetic character in $3d$ series elements increase from $d^1$ to $d^5$ configuration and then decreases as the number of electrons decreases.