Please choose the correct sequence that describes the excitement of an atom. Such an electron transition raises the atom from the ground state to the excited state.
When energy is added to an atom from an outside source, its electrons move to a higher energy level (orbit)
As a result, the atom emits a photon.
When the atom is in an excited state, the electron can drop from the higher energy level to a lower energy level.

A) 2, 1, 4, 3

B) 4, 3, 2, 1

C) 3, 4, 1, 2

D) 1, 2, 3, 4

i don't know

Explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

yes the answer is total mass in unchanged   : )