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What are atoms, molecules, and ions?

Answer 1

see below.

Protons, neutrons, and electrons are the three fundamental components of an atom, which is the smallest unit of any element.

A molecule is made up of several similar atoms, whereas a compound is made up of several different atoms.

An atom or molecule is an ion when it gains or loses an electron: {positive ion at electron loss & negative ion at electron gain.}

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Answer 2

Luna Chen

Atoms are the basic building blocks of matter, consisting of protons, neutrons, and electrons. Molecules are formed when two or more atoms chemically bond together. Ions are atoms or molecules that have gained or lost one or more electrons, resulting in a net electrical charge.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.