Q:
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
Answer & Explanation
Answer: C) isobars
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.
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