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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?

Avariable that is not being directly tested during an experiment should be

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa