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Q: Neutrons are present in the nucleus of all atoms EXCEPT in those of _____.
  • A. Oxygen
  • B. Hydrogen
  • C. Nitrogen
  • D. Carbon
Correct Answer: Option B - Hydrogen (H) is the first element of the periodic table. Its atomic number and atomic weight is 1 and 1.0087u respectively. It has only one proton in its nucleus and neutron is absent in its nucleus.
B. Hydrogen (H) is the first element of the periodic table. Its atomic number and atomic weight is 1 and 1.0087u respectively. It has only one proton in its nucleus and neutron is absent in its nucleus.

Explanations:

Hydrogen (H) is the first element of the periodic table. Its atomic number and atomic weight is 1 and 1.0087u respectively. It has only one proton in its nucleus and neutron is absent in its nucleus.