Number of electrons present in the 3d sub-shell of an element having atomic number 37 is :

number of electrons present in M shell of an element with atomic number 26 in its M^(3+) state will be

The number of electrons present int the valence shell of an atom with atomic number 38 is

What is the number of valence electrons in the atoms of an element having atomic number 13 ? Name the valence shell of this atom.

The number of electrons present in M shell of aluminum atom:

Number of electrons present in the penultimate shell of magnesium atom.