Which of the following best describes how an electron moves when it absorbs or releases exact amounts of energy?
a. the electron moves to the ground state.
b. the electron moves between orbital levels. c. the electron moves to bond with other electrons. d. the electron moves beyond ionization potential.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.