Question #01331

1 Answer
Mar 23, 2017

Answer:

3s

Explanation:

You can see the relation between Energy of the orbitals and principal quantum number as below
#E= -(13.6/n^2)eV#

So, 2s orbital has #E= -(13.6/2^2)eV = -3.4 eV#
and
3s orbital has #E= -(13.6/3^2)eV = -1.51 eV#

So, 2s has lower energy and it is stable,
and 3s has higher energy.