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Unit Test- Atomic Structure - History and Structure of the Atom Questions and Answers Latest Updated
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Unit Test- Atomic Structure - History andStructure of the Atom
When was the idea of an atom first developed? - answer John Dalton, 1803.
State the 4 major ideas of Dalton's Atomic Theory - answer1. Matter is made up with
atoms that are invisible and indestructible
2. All atoms of an element are identical
3. Atoms of different elements have different weights and different chemical properties.
4. Atoms of different elements combine in simple whole numbers to form compounds.
Describe the experiment that led to the discover of the electron. Who discovered it? -
answer Experimented with Crookes, cathode ray, and a tube. The experiment showed
that cathode rays were negatively charged. Joseph John "J.J." Thomson in 1897.
Describe Rutherford's gold foil experiment. What did this experiment tell us about the
structure of the atom? - answer Rutherford shot a beam of alpha particles at a sheet of
gold foil. He concluded that a tiny, dense nucleus was causing the deflections.
What are the 3 subatomic Particles? - answerProton, Neutron, and Electron.
Who discovered the Neutron. - answerJames Chadwick
Who determined the charge of the electron and during what experiment. - answerRobert
A. Millikan during the Oil Drop Experiment.
Describe the Electron Cloud Model of the Atom. What are the smallest parts of an atom
we know today? - answerThe electron cloud model includes an electron cloud around
the nucleus which contains neutrons and protons.
1. electrons
2. protons
3. neutrons
What does the atomic number of an element represent? What does the mass number of
an atom represent? - answerThe atomic # represents the distinct identity of an element
and number of protons
The mass # represents the sum of protons and neutrons
What are isotopes? How are they similar to each other? How are they different? -
answerIsotopes are always, with the same number of protons but different number of
neutrons.
- they have the same number of protons
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