Which sentence states what Rutherford concluded from the gold foil experiment?
The atom's positive charge is spread evenly about the atom.
An atoms negative charge is concentrated in it's nucleus.
Thomson's model of the atom was correct.
At atom's positive charge is concentrated in it's nucleus.
Which of these is always equal to the element's atomic number?
Number of neutrons
Number of electrons
Number of protons
Number of nuclei
Which statement tell's how Bohr's model of the atom differed from Rutherford's model?
Bohr's model focused on the electrons.
Bohr's model focused on the nucleus.
Bohr's model focused on the neutrons.
Bohr's model focused on the protons.
Which is true when all of an atoms electrons are in orbitals with the lowest possible energies?
The electrons are in an unstable configuration.
The atom is in its ground state.
The electrons are in the most stable configuration.
The atom is in an excited state.
Democritus coined this word for a tiny piece of matter that cannot be divided
atom
electron
element
molecule
Democritus thought that matter was made of tiny particles
of earth, air, fire, and water.
that were all round and smooth.
that could be divided.
that could not be divided.
Which of the following is NOT part of Dalton's atomic theory?
All atoms of the same element have the same mass.
All elements are composed of atoms.
A compound contains atoms of more than one element.
Atoms contain subatomic particles.
J. J. Thomson's experiments provided evidence that an atom
contains negatively charged particles.
has a negative charge.
is the smallest particle of matter.
has a positive charge.
Who provided evidence for the existence of a nucleus in an atom?
Democritus
Ernest Rutherford
J. J. Thomson
John Dalton
Which subatomic particle has a negative charge?
Proton
Alpha particle
Neutron
Electron
Which statement about subatomic particles is NOT true?
Protons and neutrons have the same charge.
Protons and electrons have opposite charges.
Protons and neutrons have almost the same mass.
Neutrons have no charge.
Which statement about particles is TRUE?
Protons, neutrons, electrons all have about the same mass.
An electron has far less mass than a proton or a neutron.
Electrons have no mass.
Neutrons have no charge and no mass.
Which of the following is unique for any given element?
Mass of a neutron
Charge on the electrons
Number of neutrons
Number of protons
The number of protons in one atom of an element is that element's
atomic number.
balanced charge.
isotope.
mass number.
To find the number of neutrons in an atom, you would subtract
Mass number from atomic number.
Atomic number from mass number
Atomic number from electron number.
Isotope number from atomic number.
