The development of mass spectrometry led to the confirmation of the existence of A) isotopes, which are atoms of the same chemical element that h...
The development of mass spectrometry led to the confirmation of the existence of
A) isotopes, which are atoms of the same chemical element that have different numbers of neutrons, thus having different charge/mass ratios.
B) isotonics, which are atoms of the same element that have the same number of neutrons, thus having different charge/mass ratios.
C) isobars, which are atoms of the same element that have the same mass number, thus having different charge/mass ratios.
D) isoelectronics, which are atoms and ions of the same element that have the same number of electrons, thus having different charge/mass ratios.
A) isotopes, which are atoms of the same chemical element that have different numbers of neutrons, thus having different charge/mass ratios.
B) isotonics, which are atoms of the same element that have the same number of neutrons, thus having different charge/mass ratios.
C) isobars, which are atoms of the same element that have the same mass number, thus having different charge/mass ratios.
D) isoelectronics, which are atoms and ions of the same element that have the same number of electrons, thus having different charge/mass ratios.
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Ed 
A alternativa correta é a letra A) isotopes, que são átomos do mesmo elemento químico que possuem diferentes números de nêutrons, tendo assim diferentes razões carga/massa. A espectrometria de massa permitiu a identificação dessas diferenças na razão carga/massa, o que confirmou a existência dos isótopos.
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