Valancy , valance electrons

The characteristic X-ray radiation is emitted when A. the bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancy B. the valance electrons are removed from the target atoms as a result of the collision C. the source of electrons emits a mono energetic bean D. the electrons are accelerated to a fixed energy

Only the unpaired electrons present in the outermost shell of an atom are called valence electrons.

The velocity of an electron in single electron atom in an orbit

Wavelength of an electron is 5Å. Velocity of the electron is

An electron is moving in 3rd orbit of Hydrogen atom . The frequency of moving electron is

If the electron of a hydrogen atom is present in the first orbit. The total energy of the electrons is

Spin of electron is

In an electron gun, the electrons are accelerated by the potential V . If the e is the charge and m is the mass of the electron, then the maximum velocity of these electrons will be

In electron transport system, the final acceptor of electrons is :

An electron is revolving around a proton. The total work done in one revolution by electric force on the electron will be zero if the trajectory of the electron is