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What is meant by the statement spectra lines are the fingerprints of elements?
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How are elements identified fro bright line spectra?
Each type of atom gives off a unique set of colors. The colored lines (or Spectral Lines ) are a kind of "signature" for the atoms
Why was Moseley able to resolve the discrepancies in Mendeleev's table when Mendeleev could not?
Because by using the lines in the xray spectra of 38 different elements, he found that the lines were correlated to atomic number, not by atomic mass.
Why did each compound produce a flame of a different color?
Different elements have different emission spectra, meaning that if the electrons in an atom are excited, they will release that energy in different color of light. The flame color depends on the elements in the compound.
Suppose you want to know the chemical composition of a distant star Which piece of information is most useful to you?
A telescope, whose light output would be sent through a spectral analysis machine of some type. That analysis of the emission spectra of the star would be compared to the known spectra of the elements to find the composition of the star.
Do lines of a particular element appear at the same wavelength in both emission and absorption line spectra?
Yes.
Can both Rutherford and Bohrs model of the atom explain spectra lines of elements?
Bohr model explain these spectra.
How would the spectra from galaxies appear?
They have broad emission lines of highly ionized elements.
Will everyone see all the lines in all the emission spectra of these elements?
Many catalogues of emission spectroscopy lines are published. These lines are not visible on all types of instruments.
How do scientists use different spectra to figure out the composition of the stars outer layer?
Different chemical elements emit (or absorb) certain specific frequencies of light. When the light from a star is split in to it's rainbow spectrum of light, certain parts of the spectrum will be black (in absorption spectra) or brighter (in emission spectra). By comparing these lines to the known emission and absorption spectra of elements, the composition of a stars atmosphere can be determined.
How are the elements identified from bright light line spectra?
Each type of atom gives off a unique set of colors. The colored lines (or Spectral Lines ) are a kind of "signature" for the atoms
How are elements identified fro bright line spectra?
Each type of atom gives off a unique set of colors. The colored lines (or Spectral Lines ) are a kind of "signature" for the atoms
Why was Moseley able to resolve the discrepancies in Mendeleev's table when Mendeleev could not?
Because by using the lines in the xray spectra of 38 different elements, he found that the lines were correlated to atomic number, not by atomic mass.
What measurement would you use to measure a stars elemental composition?
If you want to know the elemental composition of a star, you look for the elements' fingerprints. These are in the form of line spectra, since each element has its own particular set of spectral lines. Atoms in the star's atmosphere will absorb their characteristic frequencies from the cavity radiation emitted from the star due to its temperature. Color
Which scientists postulated that the sharp lines in the emission spectra of elements are caused by electrons moving from high energy levels to low energy levels?
Niels Bohr
Why did each compound produce a flame of a different color?
Different elements have different emission spectra, meaning that if the electrons in an atom are excited, they will release that energy in different color of light. The flame color depends on the elements in the compound.
How is a star simmular to the Sun if it has the same absorption lines in its spectrum that occur in the Sun's spectrum?
because they will have the same elements in the atmosphere...
Who was more lines on thee fingerprints boys or girls?
girls
