Question

Reactivity is defined as the capacity of a unit of matter, such as an atom, to undergo a chemical reaction with another unit of matter. What determines an atom's reactivity? O A. The number of protons in its outer shell. O B. The number of electrons in its outer shell. C. The number of protons and neutrons in its nucleus. D. The number of electrons and protons in its nucleus.​

Answer 1

Answer:

b

Explanation:

Answer 2

Statement that explains atom's reactivity which is the capacity of a unit of matter is B:  The number of electrons in its outer shell.

Atom's reactivity is usually as a result of the  number of electrons that is present in the outermost shell of an atom.

• For instance,  Noble gases do exhibit low reactivity as a result of full electron shells. Alkali metals on the other hand has high reactivity because they readily lose the single electron in their outermost shell.

Therefore, option B is correct.

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