Ch. 5 Lesson 7

Which of the following transitions within an atom is not possible?

An electron begins in an excited state and then gains enough energy to jump to the ground state

When an atom absorbs a photon containing energy, any of the following can happen except which?

An electron moves from an upper energy level to a lower one

Which of the following statements are true? (mark all that apply) Electrons in atoms can gain energy when they collide with other atoms Electrons in atoms can gain energy by absorbing photons Electrons in atoms can lose energy by emitting photons The absorbed or emitted photon has the energy equal exactly to the energy gained or lost by the electron. For hydrogen atom, only transitions from n = 3, n = 4, n = 5, n = 6 levels to n = 2 level result in emissions of visible light. The first excited state is labeled by n = 1.

Electrons in atoms can gain energy when they collide with other atoms Electrons in atoms can gain energy by absorbing photons Electrons in atoms can lose energy by emitting photons The absorbed or emitted photon has the energy equal exactly to the energy gained or lost by the electron. For hydrogen atom, only transitions from n = 3, n = 4, n = 5, n = 6 levels to n = 2 level result in emissions of visible light.

Which of the following statements about electrons is false? Electrons orbit the nucleus rather like planets orbiting the Sun. Within an atom, an electron can have only particular energies. Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels. An electron has a negative electrical charge. Electrons have very little mass compared to protons or neutrons.

Electrons orbit the nucleus rather like planets orbiting the Sun

How can an electron in an atom gain energy to go from a lower energy level to a higher energy level? (mark all that apply) It can gain in a collision with another atom. It releases a photon equal in energy to its own energy drop. It absorbs a photon equal in energy to its own energy drop. It loses gravitational potential energy. It exchanges gravitational potential energy for kinetic energy.

It can gain in a collision with another atom It absorbs a photon equal in energy to its own energy drop

How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?

It releases a photon equal in energy to its own energy drop

Which of the following statements are true? (mark all that apply) When we say that electron energy levels in atoms are quantized we mean that the electrons can have only specific energies and not amounts of energy in between. Correct It take more energy to move an electron from the ground state to the 1st excited state then to move it from the 1st excited state to the 2nd excited state. Electrons can stay in exited state forever. Correct Electrons with energies in between the allowed values simply don't exist in atoms. Correct Electrons in an atom can make transitions between the allowed orbits/energy levels by absorbing or emitting exactly the energy difference between the orbits.

When we say that electron energy levels in atoms are quantized we mean that the electrons can have only specific energies and not amounts of energy in between. It take more energy to move an electron from the ground state to the 1st excited state then to move it from the 1st excited state to the 2nd excited state. Electrons with energies in between the allowed values simply don't exist in atoms. Electrons in an atom can make transitions between the allowed orbits/energy levels by absorbing or emitting exactly the energy difference between the orbits.

A) Which transition represents an electron that absorbs a photon with 10.2 eV of energy? [a] B) Which transition represents an electron that emits a photon with 10.2 eV of energy? [b] C) Which transition represents an electron that absorbs a photon with 2.6 eV of energy? [c] D) Which transition represents an electron that emits a photon with 2.6 eV of energy? [d] E) Which transitions result in emission of a photon of visible light? [e], [f], and [g] F) Which transitions involve in absorption of a photon of visible light? [h] and [i]

a. 2 b. 13 c. 5 d. 16 e. 16 f. 17 g. 20 h. 5 i. 6

A) Which transitions, as shown, are not possible? [a], [b], [c], [d], and [e] B) Which transition represents the electron that emits a photon with the highest energy? [f] C) Which transitions represent an electron that is breaking free of the atom? [g] and [h] D) Which transitions represent an electron captured by the atom? [i] and [j]

a. 3 b. 10 c. 14 d. 18 e. 21 f. 12 g. 4 h. 11 i. 15 j. 22

An electron-volt (eV) is

an unit of energy much smaller than a joule

An atom in an excited state contains more of what type of energy than the same atom in the ground state?

electric potential energy