Exam (elaborations)
Atomic Theory Questions and Answers
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Exam of 2 pages for the course Atom at Atom (Atomic Theory)
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Atomic TheoryWhat major contribution did Rutherford provided to the Atomic Theory? – answer
Discovered that atoms have a positive charge in the core and negative charges outside
the core.
Atoms are mostly made of space.
Who conducted the gold foil experiment? - answer Ernest Rutherford
What major contribution did Thomson make to the Atomic Theory? - answerDiscovered
that atoms can be split into smaller particles (protons and electrons).
Who made the plum pudding model of an atom? – answer J.J Thomson
What does the plum pudding model show? - answer An atom is a ball of positively
charged material with negatively charged particles floating around inside.
What did Lavoisier contribute toward the Atomic Theory? - answer Proposed the Law of
Conservation of Matter
Created the metric system
What does the Law of Conservation of Matter State? - answer Matter cannot be created
or destroyed. It can only be converted into other matter.
What was Dalton's contribution to the Atomic Theory? - answer Atoms of the same
element are exactly alike.
Atoms of different elements are different.
Atoms can join with other atoms to make new substances.
What was Bohr's contribution to the Atomic Theory? - answer Electrons travel around
the nucleus of an atom in definite paths.
Electrons can jump from one energy level (path) to another.
What was Schrodinger's contribution to the Atomic Theory? - answer The exact location
of an electron cannot be found.
Electrons travel in electron clouds which represent where the electron is most likely to
be found.
What was Chadwick's contribution to the Atomic Theory? - answerDiscovered the
existence of neutrons.
He found that the atomic mass of most elements is double the number of protons for
one atom of that element.
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