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The reactivity of an atom arises primarily from ___.
a. the energy difference between the electron shells.
b. the potential energy of the outermost shell.
c. the average distance of the outermost shell from the nucleus.
d. the sum of the potential energies of all-electron shells.

Respuesta :

Answer:

E. existence of unpaired electrons in the outermost shell.

Explanation:

The reactivity of an atom arises primarily from the average distance of the outermost shell from the nucleus.

  • The number of electrons in the outermost shell of an atom determines its reactivity.
  • Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
  • The larger an atom is, the more reactive it will be.
  • Reactivity increases with atomic number in a group as well as in a period.

Thus, the correct option is C.

Learn more:

brainly.com/question/15777471

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