Question
Which of the following is NOT an isotope of hydrogen atom?
The correct answer is
Helium
Hydrogen Isotopes Explained
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number (mass number). All isotopes of hydrogen have one proton.
Identifying Isotopes of Hydrogen
- Protium (1H): 1 proton, 0 neutrons. This is the most common form of hydrogen.
- Deuterium (2H or D): 1 proton, 1 neutron. Also known as "heavy hydrogen".
- Tritium (3H or T): 1 proton, 2 neutrons. This isotope is radioactive.
Why Helium is Not a Hydrogen Isotope
Helium (He) has an atomic number of 2, meaning each atom of helium contains 2 protons. Since isotopes must have the same number of protons (belonging to the same element), helium cannot be an isotope of hydrogen, which always has 1 proton.
Conclusion
Therefore, Helium is NOT an isotope of the hydrogen atom.
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Important Questions from Structure of Atom
- According to Bohr's model, electromagnetic radiations possess dual character properties behaving like:
- The atomic number of an element is equal to which of the following?
- Which of the following factors primarily determines the size of an atom?
- The atomic radius of hydrogen atom is
- An electron and a photon have same de Broglie wavelength. It implies that they have the same
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