Find the number of electrons present in 1 coulomb charge?

Quantum Nature of Charge In Milikan's oil drop experiment , the charge present on an oil drop is 12.8 xx 10^(-18)C, Calculate the number of electrons presents in oil drop.

Define 1 Coulomb.

The number of electrons present in the valence shell of group 13:

Maximum number of electrons present in "N" shell is:

Fill in the blanks :The number of unpaired electrons present in the sulphur atom is …………