Structure of Atom Part 1

n=1 means ground state
n=2 means 1st excited state
n=3 means 2‌nd ‌ excited state
Remember: n‌th ‌ excited state means n=n+1
We know energy of an atom is given by
Energy (E)=−13.6×‌

Z2

n2

=−13.6×‌

1

9

[∵Z= atomic number =1 for hydrogen atom ]
=−1.51‌eV