The sums of first and second ionization energies and those of third and fourth ionization energies `("in kJ mol"^(-1))` of nickel and platinum are: `{:(,(IE_(1)),+(IE)_(2)),(,Ni,2.49),(,Pt,2.66):}` `{:(,(IE_(3)),+(IE)_(4)),(,Ni,8.80),(,Pt,6.70):}`
Justify using above data why `Ni^(+2) and Pt^(+4)` are more stable than their corresponding counter part ions ?

ionisation energies of Ni and Pt in Kjmol^(-1) are given below {:(,ubrace((IE)_(1)+(IE)_(2)),ubrace((IE)_(3)+(IE)_(4))),(Ni,2.49,8.80),(Pt,2.60,6.70):} So, (select the correct statement)

The first (IE_1) and second (IE_2) ionisation enthalpies ("kJ mol"^(-1)) of a few elements designated by Roman numerals are shown below. {:(,,IE_(1),IF_(2)),(,I,2372,5251),(,III,900,1760):} {:(,,IE_(1),IE_(2)),(,II,520,7300),(,IV,1680,3380):} Which of the above element is likely to be: a noble gas

The first (IE_1) and second (IE_2) ionisation enthalpies ("kJ mol"^(-1)) of a few elements designated by Roman numerals are shown below. {:(,,IE_(1),IF_(2)),(,I,2372,5251),(,III,900,1760):} {:(,,IE_(1),IE_(2)),(,II,520,7300),(,IV,1680,3380):} Which of the above element is likely to be: a reactive non-metal

The first (IE_1) and second (IE_2) ionisation enthalpies ("kJ mol"^(-1)) of a few elements designated by Roman numerals are shown below. {:(,,IE_(1),IF_(2)),(,I,2372,5251),(,III,900,1760):} {:(,,IE_(1),IE_(2)),(,II,520,7300),(,IV,1680,3380):} Which of the above element is likely to be: a reactive metal

The first (IE_1) and second (IE_2) ionisation enthalpies ("kJ mol"^(-1)) of a few elements designated by Roman numerals are shown below. {:(,,IE_(1),IE_(2)),(,I,2372,5251),(,III,900,1760):} {:(,,IE_(1),IE_(2)),(,II,520,7300),(,IV,1680,3380):} Which of the above element is likely to be: a metal A that forms a stable binary halide of the formula AX_(2) ("X = halogen")