The element having general electronic configuration $3d^4 4s^1$ is

Which of the following elements in their respective oxidation states does not develop spin only magnetic moment? $[Ti (Z=22), Zn(Z=30), V(Z=23), Cu(Z=29)]$

An amalgam is $.......$

Which of the following ions is paramagnetic?

In a transition series,as the atomic number increases,paramagnetism

In the electronic configuration of which of the given elements,$Aufbau$ principle or $(n+l)$ rule is violated?