science
Grade-9
Easy
Question
Which of the following is not a pair of isotopes?
- C12 and C14
- Cl35 and Cl37
- Ar40 and Ca40
- None of these
Hint:
Isotopes are atoms with the same number of protons, but differing numbers of neutrons. Isobars are atoms of different chemical elements having equal values for atomic mass. Isotones are atoms of different elements having an equal number of neutrons in the atomic nucleus. Isotopes have the same atomic number.
The correct answer is: Ar40 and Ca40
An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties. Every chemical element has one or more isotopes.
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