# Question #0d50a

Apr 25, 2017

C. the electron gains energy

#### Explanation:

When an electron moves to a higher state ,it means that the electron is excited !!!!!! or any state above the ground state

By states I mean the principal energy levels or electron shells named as

$\left(n = 1 , 2 , 3 , 4 , 5 , 6 , 7 , \ldots \ldots \ldots \ldots\right)$

n = 1 is shell which is closest to the atom's nucleus

For example

These shells are also represented as letters starting from $K$
$n = 1$ is said the K shell
$n = 2$ is said the L shell
$n = 3$ is called the M shell...............................

Therefore the no. of electrons in K shell of carbon is 2.

When the electron moves a higher state from its ground state it gains Potential Energy as it feels less attraction from the nucleus.
While when it moves a shell below like ${n}_{2}$ to ${n}_{1}$ it loses Potential energy and feels more attraction from the nucleus.