Module 2: Chapter 8 Quiz

Protons and neutrons have about the same mass.

True

Photons of which of the following colors of light possess the greatest amount of energy?

blue

Rutherford concluded from his calculations that the volume of an atom

is mostly empty space.

Neutral atoms of a given element all have the same

number of protons. atomic number. number of electrons.

1. According to the cartoon video on physics, if light always behaved as particles, what would be seen if it were sent through 2 slits?

2 lines

Heisenberg's uncertainty principle says that you cannot know the momentum or the position of an electron exactly.

False

The atomic number of an element is the total number of protons and neutrons in the nucleus.

False

What is unique about noble gases that causes it to be very chemically stable?

They have completely filled their outer orbital with electrons

what do astronomers use spectral lines for?

To determine the composition of stars

An electron moves from one orbital to another only when it absorbs or emits energy.

True

Millikan found that all of the oil droplets in his apparatus carried a charge that was an integer multiple of one particular value.

True

Protons are so much more massive than electrons that you can neglect the mass of electrons when determining the mass of an atom.

True

According to the video on spectral lines, what do astronomers use spectral lines for?

considers the electron as a wave.

The quantum mechanical model of the atom differs from the Bohr model in that it

considers the electron as a wave.

The energy of a photon of light emitted by an electron equals the

difference in energy between two levels.

The atomic number of an element is the number of

protons.

Isotopes of an element are atoms that have

the same number of protons, but a different number of neutrons.

1. Niels Bohr's model of the hydrogen atom

was controversial because it contradicted accepted principles of physics. held that electrons existed in allowed orbits and nowhere else. accounted for the observed spectrum in hydrogen.

According to the video on spectral lines, the velocity of the light source reveals itself in tiny shifts in the _______ of the spectral lines.

wavelength