Thinking about what learned at this point… Astronomers can use spectroscopy to determine the chemical composition, mass and temperature of star. With that information, what could we determine about that star? Spectroscopy can also help us determine the temperature of stars. What condition/s of life will that help us identify?
In this visible light spectrum, which color has the: Highest energy, Lowest Energy, Longest Wavelength, Shortest Wavelength?

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.