In the periodic table,metals usually used as catalysts belong to:

Based on the given outer electronic configurations,which element will exhibit the highest oxidation state?

The electronic configuration $4d^3$ $5s^2$ belongs to which group in the periodic table?

Determine the name and symbol of the element with atomic number $103$.

Assertion : $Cr(VI)$ in the form of dichromate in acidic medium is a strong oxidising agent whereas $MoO_3$ and $WO_3$ are not.
Reason : $Mo(VI)$ and $W(VI)$ are found to be more stable than $Cr(VI)$.

Explain briefly how the $+2$ oxidation state becomes more stable in the first half of the first-row transition elements as the atomic number increases.