Elements $A$ and $B$ with their respective electronic configurations $3d^{10} 4s^1$ and $4d^{10} 5s^1$ in their outermost shell are

The calculated spin-only magnetic moment of $Cr^{2+}$ ion is: (in $text{ BM}$)

The metal commonly present in brass and german silver is

Which ion has the highest magnetic moment (only spin)?

The outermost shell electronic configuration of a transition element is:

Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are:
$I$. They have high melting points,higher than those of pure metals.
$II$. They are very hard.
$III$. They retain metallic conductivity.
$IV$. They are chemically more reactive than the pure metals.