Q 2722123931.     `S_1` : In modern periodic table each block contains a number of columns equal to the number of electrons that can occupy that sub-shell.
`S_2` : The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration.
`S_3` : The size of the isoelectronic species is effected by electron-electron interaction in the outer orbitals.
`S_4` : Any thing that influences the valence electrons will affect the chemistry of the element and the valence shell is not affected by nuclear mass.

A

FFTT

B

TTFT

C

FTFT

D

TTTT

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