Among the following pairs of orbitals which orbital will experience the larger effective nuclear charge? (i) 2s and 3s, (ii) 4d and 4f, (iii) 3d and 3p

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In a Xe atom, which atomic shell would experience the largest effective nuclear charge?

The correct option is A 1sThe Atomic Shell which is nearer to Nucleus ( i.e. which is of lower energy) experiences largest effective nuclear charge because electrons in this shell experience least Shielding and hence larger effective nuclear charge.

In a $X e$ atom, which atomic shell would experience the largest effective nuclear charge?

The correct option is A $1 s$
The Atomic Shell which is nearer to Nucleus ( i.e. which is of lower energy) experiences largest effective nuclear charge because electrons in this shell experience least Shielding and hence larger effective nuclear charge.