Atomic mass is an average of the elements.

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?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Do polar molecules have ionic bonds?