Question

part a
what is an ion?
an ion is an atom or group of atoms that becomes electrically charged due the gain/loss of electrons.
an ion is a group of more than one atom that is electrically neutral.
an ion is an atom or group of atoms that becomes negatively charged due the gain of electrons.
an ion is an atom or group of atoms that becomes positively charged due the loss of electrons.
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Explanation:

An ion is formed when an atom or a group of atoms gains or loses electrons. This gain or loss of electrons gives the ion an electrical charge. The second option is incorrect because an ion is not electrically neutral. The third and fourth options are too narrow as they only mention negative or positive charge (gain or loss of electrons respectively), while the first option covers both possibilities (gain/loss of electrons leading to electrical charge).

Answer:

An ion is an atom or group of atoms that becomes electrically charged due the gain/loss of electrons.