Question
Question: Which represents alkali metals (i.e. 1st group metals) based on (IE)1 and (IE)2 values (in kJ/mol) ?...
Which represents alkali metals (i.e. 1st group metals) based on (IE)1 and (IE)2 values (in kJ/mol) ?
(IE)1 (IE)2 (IE)1 (IE)2
A
X 500 1000
B
Y 600 2000
C
Z 550 7500
D
M 700 1400
Answer
Z 550 7500
Explanation
Solution
Removal of Ist electron is easier because of bigger size but 2nd electron is to be removed from ns2 np6 configuration i.e. stable noble gas configuration. So IE2 > > IE1.