How does the size of a barium ion compare to the size of a barium atom? The ion is smaller because it has fewer electrons. Can someone explain why this is the answer, I really don't understand.

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

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

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.