how much energy does an electron possess in it's ground state if it is placed in a cube of dimension 50nm​

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

If 90.0 grams of ethane reacted with excess chlorine, how many grams of dicarbon hexachloride would form

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?