1.9 atomic emission spectra

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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In which state does an electron have the least amount of energy?

• Excited state

• Ground state

• Orbital

• Bohr model

When electrons of an element reach an excited state, _______ lines are produced.

• dark

• emission (bright)

• continuous

• invisible

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Emission spectra (bright line spectra) are created when electrons move from ___.

• higher to lower energy levels.

• lower to higher energy levels.

• s orbitals to p orbitals.

• one atom to a different atom.

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True or False: The ground state is the highest energy state of an atom.

• True

• False

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For an electron to change from ground state to an excited stated it must...

• Absorb energy
• Release energy

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Line emission spectrum shown below happens when

• Electron transition from lower to higher energy level.
• Electron transition from higher to lower energy level.
• Electron exist in fixed energy states
• Electron transition between different energy levels.

Why are line emission spectra of elements called "atomic fingerprints"?

• They are all the same
• They are all unique
• They are all similar
• They all contain colored light

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NGSS.HS-PS1-1

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All stars are composed of a mixture of elements. When these elements are heated they emit specific amounts of electromagnetic radiation, known as an emission spectrum. Each element emits a unique, identifiable, spectrum.

Using the Bright-line emission spectrum chart below, identify the elements present in this modeled star (found in the line labeled “mixture”).

• Lithium and cadmium are in the mixture. Strontium is not in the mixture.

• Lithium and strontium are in the mixture. Cadmium is not in the mixture

• Cadmium and strontium are in the mixture. Lithium is not in the mixture

• All of the shown elements are present in the mixture.

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NGSS.HS-ESS1-3

The unknown emissions spectra belongs to the element

• Hydrogen

• Mercury

• Neon

• Sodium

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