Bohr Model Emission and Absorption Spectra

A scientist has a sample of an unknown gas. In order to identify the gas, they look at the spectrum of visible light emitted from it when it is heated. This is shown in the figure. Also shown in the figure are the emission spectra of five pure, gaseous elements. Which of the five elements is the unknown gas?

• helium

• neon

• xenon

• oxygen

• argon

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How are electrons arranged in an atom?

• In groups of five

• In energy levels

• By color

• By shape

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A scientist has a sample of an unknown gas. In order to identify the gas, they look at the spectrum of visible light emitted from it when it is heated. This is shown in the figure. Also shown in the figure are the emission spectra of three pure, gaseous elements. Which of the three elements is the unknown gas?

• helium

• hydrogen

• oxygen

Tags

NGSS.HS-PS4-1

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What does the Bohr model primarily describe?

• The arrangement of protons in the nucleus

• The arrangement of electrons in energy levels

• The arrangement of neutrons in the nucleus

• The arrangement of atoms in a molecule

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In the Bohr model, what happens when an electron moves to a higher energy level?

• It emits a photon

• It absorbs a photon

• It remains stable

• It loses energy

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What is the main feature of the emission spectrum in the Bohr model?

• Continuous spectrum

• Discrete lines

• Random colors

• Single color

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Which of the following is true about absorption spectra?

• They are continuous

• They have dark lines

• They are identical to emission spectra

• They are not related to energy levels

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What is the significance of the Rydberg formula in the Bohr model?

• It calculates the speed of electrons

• It predicts the wavelengths of spectral lines

• It determines the mass of an electron

• It measures the energy of protons

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How does the Bohr model explain the stability of atoms?

• By describing electron orbits as fixed paths

• By introducing quantum numbers

• By using probability clouds

• By considering electron spin

What is the relationship between energy levels and spectral lines in the Bohr model?

• Higher energy levels produce more lines

• Lower energy levels produce more lines

• Spectral lines are independent of energy levels

• Spectral lines correspond to transitions between energy levels