Cl and cl are isotopes of each other. the first one has 17 protons and 18 neutrons. the second one has 17 protons and 20 neutrons.
Isotopes were also members of the exact same element's family but also have different neutron numbers despite containing the same count of protons. On the Periodic Table, an element's atomic number is based on how many protons are in its nucleus.
Cl-35 have atomic number 17 , atomic mass is 35
Number of neutrons = atomic mass - atomic number
Number of neutrons = 35-17
Number of neutrons = 18
Cl-37 have atomic number 17 , atomic mass is 37
Number of neutrons = atomic mass - atomic number
Number of neutrons = 37-17
Number of neutrons = 20
Therefore, Cl-35 and Cl-37 are isotopes of each other. the first one has 17 protons and 18 neutrons. the second one has 17 protons and 17 neutrons.
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