"which is a characteristic of atoms?
they come in ten major types.
they are the smallest units of matter,
they can be divided,
they cannot combine together,

they are the smallest units of matter bebe:)

The correct answer is- They are the smallest units of matter,.

Explanation:

Atoms are the smallest unit of which a matter composed of. Protons, neutrons, and electrons are present in an atom. Protons and neutrons together make the nucleus of the atom.  

Protons are positively charged particles and neutrons are neutral therefore nucleus is having a positive charge due to the protons present in it. Electrons are negatively charged particles that revolve around the nucleus.

The electromagnetic force is generated between the negative charge of electrons and the positive charge of the nucleus which helps the atom to stay together in the matter.  

Therefore, the correct answer is atoms are the smallest units of matter.

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-lavira: )