Answers Chemistry - SC3210 CRThe Modern Atomic Theory

Atomic Numbers and Electron Configurations Answers

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Which statement about Niels Bohr’s atomic model is true?

Higher orbits have lower energies.

Each orbit has a specific energy level.

Electrons can exist in any energy level.

Orbits close to the nucleus have no energy.

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Which event would be impossible to explain by using John Dalton’s model of the atom?

An iron atom emits particles when it is struck by light.

An oxygen atom combines with two hydrogen atoms to form water.

An acid reacts with a base to form salt and water.

The atoms in sodium metal react with water.

Which equation was used by Albert Einstein to explain the photoelectric effect? [E = energy, h = Planck’s constant, and v = frequency.]

E =

E = hv

E =

E = h - v

The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. Which is a correct explanation of the photoelectric effect according to the model?

Electrons are emitted with more speed when brighter light strikes them.

Electrons need small amounts of energy to be released from an atom.

Electrons move between levels only if they are hit by the right frequency of light.

Electrons need specific amounts of energy to jump levels and be emitted.

Which statement describes a major drawback of the Bohr model that caused scientists to replace it?

It worked only for helium and larger atoms.

It did not identify the distance between an electron and the nucleus.

It contradicted the Heisenberg uncertainty principle.

It stated that spectral lines of atoms are similar.

The diagram shows Niels Bohr’s model of an atom. What happens when the electron moves from the first energy level to the second energy level?

Energy is absorbed, and an emission line is produced.

Energy is released, and an emission line is produced.

Energy is absorbed by the atom.

Energy is lost from the atom.

Light of a certain energy shines on a metal and causes electrons to be emitted. Based on the research of Albert Einstein, what change would most likely result in stopping the emission of electrons from this metal?

an increase in the intensity of the light

a decrease in the intensity of the light

the use of light that has a higher frequency

the use of light that has a lower frequency

How does the electron-cloud model describe electrons?

The exact position of an electron can be known.

An electron can be found at certain distances from the nucleus.

An electron has a high probability of being in certain regions.

Each electron follows a specific path around the nucleus.

The modern-day quantum model of the atom is better than John Dalton’s model because it

has set electron orbits.

has positive and negative particles in the nucleus.

can be represented in one dimension.

answers many questions about atoms.

Which atomic model states that it is impossible to know the exact location of electrons around the nucleus?

Bohr model

Dalton model

plum pudding model

electron-cloud model

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Atomic Numbers and Electron Configurations Answers

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