Models
Which of the following most accurately represents John Dalton’s model of the atom?
a tiny sold sphere
Rutherford’s gold foil experiment provided evidence for which of the following statements?
There is a dense nucleus with positive charges
The atomic number represents the number of ___________.
protons
What is oxygen-17 and oxygen-18?
they are isotopes
What is true about the Ancient Greeks belief about tiny particles?
a. of earth, air, fire, and water.
b. that could not be divided.
d. that were all round and smooth.
In Rutherford’s gold foil experiment, alpha particles that bounce straight back from the foil have struck _____________in the gold atoms?
nucleus
The mass of a proton is roughly equal to the mass of a(n) __________.
neutron
Which of the following is unique for any given element?
the number of protons
J.J. Thomson’s experiments provided evidence that an atom
has negatively charged particles
Which statement accurately represents the arrangement of electrons in Bohr’s atomic model?
Electrons travel around the nucleus in fixed energy levels with energies that vary from level to level.
The number of neutrons is equal to the _________ number minus the atomic number.
mass
The region in which an electron is most likely to be found is called a(an) _______________.
electron cloud
How was Bohr’s atomic model similar to Rutherford’s model?
There was a large volume of space around the nucleus
Which statement best describes Rutherford’s model of the atom?
A stadium with a marble in the center
Compare the mass of protons, electrons, and neutrons