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There are three natural isotopes for element L (L- 124, L-126, and L-127). Below are the atomic masses and percent abundances of element L. Determine the average atomic mass of the element.   L-124  123.9992 amu  22.101%  L-126  125.9909 amu  10.710%  L-127  126.9871 amu  67.189% 

 Which of the following experiments identifies a physical rather than a chemical property of a substance?

Below are the line spectra for Elements A-D and an unknown sample. What is the unknown sample composed of?

How many nanometers are in 256 cm?

How many cubic millimeters of silver have a mass of 0.0020 kg if the density of silver is 10.54 g mL-1? (1cm3 = 1mL)

Which of the following experiments identifies a physical rather than a chemical property of a substance?

Determine if the following statements about the relationship between energy, wavelength, and frequency of light are True or False.  As the wavelength of light increases, the energy of the light decreases. [1] As the frequency of light decreases, the energy of light increases. [2] A light with a frequency of 5.45 x 1014 Hz has a longer wavelength than a light with a frequency of 8.20 x 1014 Hz. [3]

What is the answer of the following problem with correct number of significant figures?  =0.0083 x 4.2 

A researcher looking for new elements found one that she plans to name cinnamonium (Ci).  The element information to be added to the periodic table is provided below, using this information how many atoms of Ci would 141.1 g contain?