(D) Isotones are defined as atoms or nuclides that possess the same number of neutrons $(N)$ but different numbers of protons $(Z)$,which consequently

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They are nuclides having the same number of neutrons but different number of protons and hence different mass numbers.

(D) Isotones are defined as atoms or nuclides that possess the same number of neutrons $(N)$ but different numbers of protons $(Z)$,which consequently leads to different mass numbers $(A = Z + N)$.Since they have different atomic numbers,they exhibit different chemical properties and occupy different positions in the periodic table.

Class 12 Chemistry Nuclear Chemistry Isotopes-Isotones and Nuclear isomers

Easy

Which among the following statements is $TRUE$ about isotones?

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A
These occupy same positions in the modern periodic table.
B
These have different number of neutrons and same number of protons.
C
These have same chemical properties.
D
They are nuclides having the same number of neutrons but different number of protons and hence different mass numbers.