1.

Consider the following statements and arrange in the order of true/false as given in the codes. 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 eletron-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.

Answer»

FFTT
TTFT
FTFT
TTTT

Solution :`S_3`:The SIZE of the isoelectronic SPECIES is not EFFECTED by electron-electron inter action in the outer orbitals but is effected by the NUCLEAR CHARGE.
`S_1,S_2 and S_4` are correct statements.


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