Where is the change in the electron configuration for Na when in an excited state? *
W
O A change in the last shell
O A change in the second and third shell
O A change in the first second and third
O No change at all

 A change in the first second and third

Explanation:

An electron in the lowest energy state is called as ground state and is also known as stable energy level.  An electron in the upper energy state is called as excited state and is also known as unstable energy level.

Electronic configuration represents the total number of electrons that a neutral element contains. The electrons are filled according to Afbau's rule in order of increasing energies. As the atomic number of sodium is 11. The electronic configuration of sodium will be represented in ground state as:

Thus any electron if occupies a higher shell, the atom is said to be in excited state.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.