Which among the given factors are  affecting electro negativity ?

Screening effect is inversely proportional to the E.N. More screening effect is produced by inner electrons, repulsive force is experienced by valence electron. Therefore possibility of entry of electron will be less .Therefore E.N decreases. Oxidation state is directly proportional to the E.N. An atom with higher oxidation state is more electronegative, as it has more effective nuclear charge.