There are two elements - calcium (atomic number 20) and argon (atomic – McqOptions

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1.	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
A.	Isotones
B.	Isochors
C.	Isobars
D.	Isotopes
Answer» D. Isotopes

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