"The stability of an multi electron atom is because total attractive interaction are more than repulsive interaction In general - Chemistry - Structure of Atom

Question

"The stability of an multi electron atom is because total
attractive interaction are more than repulsive interaction In
general the repulsive interaction of the electron in the outershell
with the electron in inner shell are more important " -NCERT Why
the repulsive interaction of the electron in the outershell with
the electron in inner shell are more important ?

Anuradha Puri · Accepted Answer

The repulsive interactions of the electrons in the outershell with
the electron in inner shell are more important because it governs
the atomic size and ionization energy of an atom The outer
electrons experience less nuclear charge due to repulsion from the
intervening inner electrons This is called shielding effect