Speed the amount of time it takes for a wavelength to pass a certain point
the distance traveled per unit of time
the range of wavelengths and frequencies of electromagnetic waves
a unit used to express frequency of a wave; one hertz is equal to one wavelength per
second
the number of wavelengths that passes a fixed point in a second

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answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.