Quiz 6a Bright Line Spectra

Regardless of how hot the flame is, when a metal ion is placed in a flame, it always give off the same color light. Why?

• The number of protons is still the same, so the same number of electrons get excited and fall back to the ground state the same way and give off the same color every time.

• The number of electrons is still the same, so the same number of electrons get excited and fall back to the ground state the same way and give off the same color every time.

• The number of neutrons is still the same, so the same number of electrons get excited and fall back to the ground state the same way and give off the same color every time.

• The number of ions is still the same, so the same number of electrons get excited and fall back to the ground state the same way and give off the same color every time.

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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 common isotopes of hydrogen have masses of 1 amu, 2 amu, and 3 amu. The average atomic mass of hydrogen is 1.00794 amu. This shows that the most common isotope has a mass of

• 1 amu

• 2 amu

• 3 amu

• 4 amu

The bright-line spectrum of an element in the gaseous phase is produced as

• protons move from lower energy states to higher energy states

• protons move from higher energy states to lower energy states

• electrons move from lower energy states to higher energy states

• electrons move from higher energy states to lower energy states

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Which statement explains why Group 18 elements are stable and unreactive?

• They are all gases

• They have low melting points.

• Their valence electron shell has reached a full octet.

• They have high ionization energies

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The diagram represents the bright-line spectra of four elements and a bright-line spectrum produced by a mixture of three of these elements. Which element is not present in the mixture?

• A

• D

• X

• Z

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