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...Explaining the periodic table in investigation you observed diff erences reactivity of alkali metals with water figure why do elements become more reactive as descend a family will learn that bohr rutherford model atom explains this trend well other trends on first let s take detailed look at contents b c lithium sodium and potassium react different rates to produce fl ammable hydrogen gas reactions release so much thermal energy ignites atomic number learned section are building blocks substances also pure er because they consist erent know from dalton theory atoms each element all protons what makes unique is contain th e an nucleus called has one proton its any single can only be does not have cannot lists for top left hand corner cell box chemists found when arranged cu according increasing copper within column similar properties gold au tells us there every we turn it into given short being where fi nd spare tin sn contains exactly if could combine would get containing make need c...