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Answer:

B) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons

Explanation:

  • An atom is the smallest particle of an element that can take part in a chemical reaction.
  • Atoms consists of subatomic particles neutrons, electrons and protons.
  • Atoms of the same element have an equal number of protons in their nucleus.
  • Atoms may, however, differ in the number of neutrons.
  • Such atoms that have a different number of neutrons but an equal number of protons are known as isotopes of an element.

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