Explain the four unpaired electrons in carbon atom through excited state.

The number of valency electrons in carbon atom (Z=6) is

The number of unpaired electrons present in the first excited state of chlorine atom is

The number of unpaired electrons present in the first excited state of chlorine atom is

The atomic nụmber of the element with the maximum number of unpaired 2p electrons in the ground state is

The engergy of separation of an electron in a Hydrogen like atom in excited state is 3.4 eV. The de-Broglie wave length (in A^@ ) associated with the electron is:

An element in +2 oxidation state has 24 electrons. The atomic number of the element and the number of unpaired electrons present in it respectively are