There are two elements calcium atomic number 20 and argon atomic number 18 The mass number of both t...........

General Science (CDS) Chemistry

There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as

isotones

isochores

isobars

isotopes

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Explanation:

Isotopes- These are atoms of the elements having the same atomic number but different mass number., Isobars-These are atoms of same mass number but different atomic number., Isotones- These are atoms of different elements having same number of neutrons.