The atomic number of carbon-13 is thirteen. The atomic mass of carbon-13 is thirteen. If different atoms have the same number of protons but different numbers of neutrons they are called . Substances composed of atoms that all have the same number of protons are called . Atoms that have gained or lost electrons and are no longer electrically neutral are called . The nucleus of an atom always contains one or more . The orbitals of an atom contain negatively charged particles called .

Explanation:

If different atoms have the same number of protons but different numbers of neutrons they are called _ISOTOPES . Substances composed of atoms that all have the same number of protons are called ___ISOTOPES . Atoms that have gained or lost electrons and are no longer electrically neutral are called IONS . The nucleus of an atom always contains one or more _NUCLEONS . The orbitals of an atom contain negatively charged particles called __ELECTRONS

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i think it's c. i'm not sure but i think so.