In an atom, electrons

are located in the nucleus
are paired with neutrons
travel outside the nucleus
are always in the same place in an atom

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

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?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?