HELP PLEASE How can you tell for sure that a redox reaction has happened?
O A. If a precipitate forms, it is a redox reaction.
O B. If compounds break apart, it is a redox reaction.
O c. If atoms rearrange, it is a redox reaction.
O D. If oxidation states change, it is a redox reaction.

Answer is D. Just took the quiz on A P E X

Explanation:

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

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).