14 Questions
Who discovered that the atom is not indivisible and is made up of even smaller particles called electrons, protons, and neutrons?
Sir J.J. Thomson
What did Eugen Goldstein's discovery of anode rays establish about the atom?
Presence of positively charged proton
According to Thomson's plum-pudding model, how are atoms described?
Large sphere of uniform positive charge with scattered electrons
What experiment performed by Geiger and Marsden led to the failure of Thomson's plum-pudding model?
α-ray scattering experiment
What particles are typically found in the nucleus of an atom?
Protons and neutrons only
How many electrons can the L-shell accommodate in an atom?
10
What did Ernest Rutherford's experiment with alpha particles and gold foil lead to the discovery of?
The nucleus of an atom
What does the atomic number of an atom indicate?
Number of protons in the nucleus
How did Niels Bohr revise Ernest Rutherford's atomic model?
Introduced quantized electron orbits
What is meant by a 'stationary state' in an atom?
When an electron is in a quantized energy level
What is the relationship between the numbers of electrons and protons in an atom?
They are equal in a neutral atom.
What is a shell in an atom?
A region around the nucleus where electrons are found.
What is revealed by the atomic number of an element?
Number of protons in the nucleus
What does Ernest Rutherford's experiment with alpha particles suggest about the nucleus?
It is small, dense, and positively charged.
Test your knowledge on J.J. Thomson's plum pudding model, which proposed that atoms are large spheres of uniform positive charge with scattered electrons. Learn more about this early atomic theory with this quiz.
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