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There are 3 Isotopes with the following mass numbers:

Argon 36

Argon 38

Argon 40

Argon has an atomic number of 18 (it therefore has 18 protons in its nucleus and 18 electrons flying round it). To get the number of neutrons one subtracts the atomic number from the mass number. This means that some Argon atoms have

18 neutrons, some

20 neutrons and some

22 neutrons

the isotope with 22 neutrons is the most common and forms 99.6% of all Argon.

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17y ago

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