Question

Energy of electron in1st orbital atom equal to?

Answer 1

HELLO THERE!

Here, I am assuming the atom to be Hydrogen atom (because you have not mentioned it). Atomic number (Z = 1).

Energy of an electron in nth orbit is given by the formula:

$E = -13.6\frac{Z^{2}}{n^{2}}$ eV/atom

For 1st orbit, n = 1.

So, we have:

$E = -13.6\frac{(1)^{2}}{(1)^{2}} = -13.6 eV atom^{-1}$

= -2.18 x 10⁻¹⁸ Joule.