Answer :
Carbon-14 and carbon-12 are considered to be isotopes because Both atoms have six protons in the nucleus, but have different atomic masses. therefore the correct answer is option E
What is the atomic number?
The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.
While the atomic mass of an atom is the sum of the total number of protons and different versions of an element called isotopes have different numbers of neutrons but the same number of protons as the atomic number.
Elements having distinct atomic numbers but the same atomic mass are known as isobars.d the number of neutrons present inside of any atom.
Since both atoms contain six protons in their nuclei but have different atomic weights, carbon-14 and carbon-12 are regarded as isotopes. hence, choice E is the right response.
Learn more about the atomic number from here
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