11 Questions
What did Thomson discover about the cathode rays in his experiment?
They were made of very tiny, negative particles called electrons.
In Rutherford's experiment, what were the three observations he made?
The brightness of the beam, the speed of the particles, and their path.
After Rutherford's experiment, what conclusions did he draw?
Atoms have a dense, positively charged center called a nucleus.
Which scientist conducted an experiment with a cathode ray and discovered electrons?
Thomson
What type of view in Rutherford's experiment allowed him to make conclusions about atoms?
Zoomed View
According to Dalton's atomic theory, atoms are:
Indivisible and indestructible
In Thomson's model of the atom, atoms contained:
Negatively charged electrons
According to the Bohr Planetary Model, electrons:
Move around the nucleus like planets around the sun
Which scientist proposed the idea that the centre of the atom has a positive charge?
Rutherford
In the nuclear model proposed by Rutherford, the majority of the atom is made up of:
Empty space
Chadwick discovered that the nucleus of an atom contains protons and:
Neutrons
Test your knowledge on the history of the atom by filling in a chart with information about key scientists and their atomic models. Topics include Democritus, Aristotle, Dalton, and Thomson's contributions to our understanding of the atom.
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