Which of the following elements is found in the human body?

The maximum and minimum melting points of the first and second transition series elements,respectively,are obtained with $-$

Which element from the following exhibits various different oxidation states from $+2$ to $+7$?

Which of the following is a soft metal?

Define transition elements and inner transition elements.

Identify the order in which the spin-only magnetic moment (in $BM$) increases for the following four ions:
$(I) Fe^{2+}$
$(II) Ti^{2+}$
$(III) Cu^{2+}$
$(IV) V^{2+}$