Spectral Lines

Each element on the periodic table can be identified by its

• classification as a solid, liquid or gas.

• location on the table.

• ability to react to form compounds.

• unique spectral "fingerprint."

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Emission spectra emitted by an element (or compound) will produce ___ through a spectroscope.

• bright lines

• a continuous rainbow

• dark lines

• white light

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NGSS.MS-PS4-2

The line with the shortest wavelength (in other words the greatest energy) is produced in the hydrogen spectrum when electron moves

• from n=2 to n=1

• rom n=4 to n=1

• from n=3 to n=1

• from n=4 to n=3

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NGSS.HS-PS4-1

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The parallel lines represents...

• energy levels of the atom
• energy levels of the electrons
• energy levels of the photons
• energy levels of the nucleus

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Light is emitted when electrons ...

• jump from high to low 
• jump from low to high 
• either of these
• none of these

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How can scientists use the color spectrum of individual elements to help determine the composition of stars in our galaxy?

• Since each element has its own unique line spectra, it is possible to use a spectrometer to examine the light being emitted by the stars to determine what elements are present?

• Since each element does not have its own unique color spectrum, it is impossible to determine what elements make up our starts.

• Since the stars are so far away, the light we would be studying can not be trusted to determine their composition.

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The unknown emissions spectra belongs to the element

• Hydrogen

• Mercury

• Neon

• Helium

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NGSS.HS-PS1-1

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Look carefully at the picture. It shows an electron in the excited state on the left, and the electron returning to its ground state on the right. When the electron return to the ground state it emits a_______________________.

• blast of cold air

• electrostatic charge

• proton

• photon (light)

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NGSS.HS-PS1-4

NGSS.HS-PS4-3

The picture shows an atom in the ground state absorbing energy and the electron jumps to the excited state. Which state has higher energy?

• Ground State

• Excited State

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Line emission spectra is produced from atoms when

• electrons release energy as they move to their excited state.

• electrons absorb energy as they move to their excited state.

• electrons release energy as they return to the ground state.

• electrons absorb energy as they return to the ground state.

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NGSS.HS-PS1-2

NGSS.HS-PS1-4

NGSS.HS-PS4-3