Taking into account the definition of mass number, atomic number and charge of an atom, the number of protons and electrons of the isotope of chlorine named chlorine-35 is 17, while the number of neutrons is 18.
All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them.
The atomic number indicates the number of protons that are present in the nucleus of an atom.
If the atom is electrically neutral, the positive charge of the protons is balanced by the negative charge of the electrons. That is, the number of protons in the nucleus is equal to the number of electrons in its orbitals, so that in a neutral atom the atomic number also indicates the number of electrons.
The mass number indicates the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus.
The atomic number of chlorine is 17, while the mass number of chlorine-35 is 35.
So, being a neutral atom, by definition of atomic number the amount of protons and electrons that the isotope of chlorine has is 17.
Finally, knowing the number of protons and the atomic mass of the isotope, the number of neutrons is calculated by:
35 =17 + number of neutrons
35 - 17 = number of neutrons
18= number of neutrons
In summary, the number of protons and electrons of the isotope of chlorine named chlorine-35 is 17, while the number of neutrons is 18.
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