1. What are the three sub-atomic particles of an atom?
2. Which sub-atomic particle/s make/s up most of the mass of the atom?
3. Which is the massive part of an atom? Why?
4. Does the electron contribute to the mass of an atom? Why?
2. Which sub-atomic particle/s make/s up most of the mass of the atom?
3. Which is the massive part of an atom? Why?
4. Does the electron contribute to the mass of an atom? Why?
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1. protons, neutrons and electrons
2. Neutrons
3. The nucleus is the positively charged centre of an atom and contains most of its mass. It is composed of protons, which have a positive charge, and neutrons, which have no charge.
4. An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.
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