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IMSO 2011 Science International – Theory I Question 17

IMSO Science · IMSO 2011 Science International – Theory I

Question 17

Atoms are considered to be the building blocks of nature. However, it is still composed of sub-atomic particles such as protons, electrons and neutrons. Which among the following statements is true?
  1. Protons have the same mass as a neutron and have no charge.
  2. Electrons are lighter than neutrons but heavier than protons.
  3. Neutrons have the same mass as an electron but have no charge.
  4. Protons are heavier than electrons and have a positive charge.