What is the energy of an electron in the 2s orbital of a hydrogen atom?

-3.4 eV ()

Explanation:

In a hydrogen atom, the energy of an electron is given by:

where

n is the principal quantum number

For an electron in the 2s orbital,

n = 2

So substituting this value into the formula, we find

And converting this into Joules, we have

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

so easy. just google the electromagnetic waves and it’ll pop up.