Question

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What characteristics do atoms of carbon-12,
carbon-13, and carbon-14 have in common?
1. same mass
2. same number of protons
3. same number of neutrons and electrons
4. same number of neutrons and protons
5. same number of electrons
6. same number of protons and electrons
7. same number of neutrons

Answer 1

7. same number of neutrons

Answer 2

ALL Carbon isotopes, have the same number of PROTONS. The number of proton of an element, which is the atomic number (represented by the symbol Z) is what distinguishes one atom from another atom.
This applies to all other isotopes, which is defined as the same atomic number but with varying mass.
Using the isotopes of Carbon: C-12, C-13, and C-14 as an example.
All of them have the same number of protons, but with varying number of neutrons. In this case, C-12 has 6 protons and 6 neutrons; C-13 has 6 protons and 7 neutrons; and finally C-14 has 6 number of protons and 8 neutrons.

Answer 3

We owe this knowledge to John Dalton and his Atomic Theory that
- ALL elements are composed of tiny particles called Atoms
- The atoms of a given elements are identical