Which represents alkali metals (ie., 1 group metals) based on `(IE)_(1)` and `(IE)_(2)` values?

Which represents alkali metals (i.e. 1^(st) group metals) based on (IE)_(1) and (IE)_(2) value (in KJ//mol) ?

Which represents alkali metals (i.e. 1^(st) group metals) based on (IE)_(1) and (IE)_(2) value (in KJ//mol) ?

Which represents alkali metals based on relative (IE)_(1) and (IE)_(2) values?

Which represents alkali metals based on relative (IE)_(1) and (IE)_(2) values?

The IE_(1) and IE_(2) (kJ mol^(-1)) of three elements A, B and C are given below : {:(,A,B,C,),(IE_(1),400,550,1150,),(IE_(2),2650,1070,2090,):} Identify the elements which represent (a) an alkali metal, (b) an alkaline earth metal or (c ) non-metal.

The IE_(1) and IE_(2) (kJ mol^(-1)) of three elements A, B and C are given below : {:(,A,B,C,),(IE_(1),400,550,1150,),(IE_(2),2650,1070,2090,):} Identify the elements which represent (a) an alkali metal, (b) an alkaline earth metal or (c ) non-metal.

IE values of alkaline earth metals are

Second ionization enthalpy (IE2) for alkali metals (Li, Na, K etc.) is very high as compared to their IE_1 values. Explain why?