A) isotopes
B) isobars
C) isotones
D) Isodiaphers
Correct Answer: B
Solution :
Isotopes: They are atoms of same element which have same atomic numbers but different atomic masses, eg, \[_{\text{1}}^{\text{1}}\text{H,}_{\text{1}}^{\text{2}}\text{H}\]and \[_{\text{1}}^{\text{3}}\text{H}\text{.}\] Isobars: They are atoms of different elements which have different atomic numbers but similar atomic masses. Isotones: These are atoms of different elements which have same number of neutrons. Their atomic numbers and atomic masses both are different, eg, \[_{6}^{12}C\] and \[_{\text{7}}^{\text{15}}\text{N}\text{.}\] \[_{\text{19}}^{\text{49}}\text{K}\]and \[_{\text{20}}^{\text{49}}\text{Ca}\]are isobars because they have same atomic mass (40).
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