Question

1st and 2nd ionisation enthalpy of group 14 elements

Answer 1

hello..!
this is formula for finding IP
Zeff=Z-sigma
Z= atomin number &
sigma=scremming constant
value for nth=0.35, n-1=0.85 ,for n-2 and n-3... n-n value always equal to 1

and answer for your question will be
si, ge,sn,pb,fl,c
carbon become stable after removing its two electron from it's p subshell