Respuesta :

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The atom must have gained 1 or more electrons or must have lost 1 or more electrons.

Explanation:

In an atom number of electrons and protons are equal. it is an electrically neutral specie.

In an ion, the number of electrons and protons are not equal. There are two types of an ion :

  1. Cation: When the number of protons are greater than number of electrons. These ions have a positive charge.
  2. Anion : When the number of electrons are greater than number of protons. These ions have a negative charge.

Hence, if an atom is considered as an ion, then it will have an unequal number of protons and electrons.

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