Platinum, Palladium and Iridium are called noble metals because

Why do ions of the first transition series exhibit paramagnetism? State the calculated and experimental observed magnetic moments of these ions.

State whether the following statements are true or false:
$(i)$ Atomic size increases with an increase in the atomic number of elements.
$(ii)$ The electron gain enthalpy for noble gases is approximately zero.
$(iii)$ The first element of the actinoid series is $Th$ and the last element is $Lu$.
$(iv)$ The general electronic configuration of $d$-orbitals is always $(n-1)d^{1-10}ns^2$.

Due to covalent bonding,the transition metals are

The electronic configuration of copper $({_{29}}Cu)$ is

All the following statements about the transition elements are true except that: