Respuesta :
Answer:
Protons
Explanation:
- Atoms are the smallest particles of elements that can take part in chemical reactions.
- They are made of sub-atomic particles: protons, neutrons, and electrons.
- Neutrons and protons are found in the nucleus of the atom while electrons are found orbiting around the nucleus in the energy levels of the atom.
- Elements may contain several isotopes, these are atoms of the same element that have the same atomic number but a different mass number.
- In other words, isotopes have an equal number of protons but a different number of neutrons.
- Therefore, all atoms of a sample carbon must have a similar atomic number or an equal number of protons in their nuclei