Atomic Structure
Name the three subatomic particles present in an atom.
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Single Choice
Which of the following sub-atomic particles is not present in an atom?
ANeutron
BProton
CElectron
DPositron
Correct Answer
Solution
Protons and neutrons are found in the nucleus of the atom. They group together in the center of the atom. Whereas, electrons are found in shells or orbitals that surround the nucleus of an atom
Positrons are produced naturally in β+ decays of naturally occurring radioactive isotopes, they are not present in an atom.
Hence, option D is correct.
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