Which are the four most abundant components of the atmosphere? taken together about what percent of the atmosphere do those four components make up?
(abundant non metals in the atmosphere is the title)

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which statement best describes the flow of energy in this scenario

Draw the structure for 5-isopropyl-2-methyl-3-nonene