by 
Anonymous
ANSWERS: 6
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Check out the Alkali Metals (gonna have to look those up yourself ;) Hope you get an A!
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Francium & Cesium are so highly reactive they will explode with almost anything, especially oxygen, and even water.
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"The alkali metals are a series of elements comprising Group 1 (IUPAC style) of the periodic table: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). (Note that hydrogen, although nominally also a member of Group 1, very rarely exhibits behavior comparable to the alkali metals)." "Alkali metals are famous for their vigorous reactions with water, and these reactions become increasingly violent as one moves down the group." "With potassium as an example: 2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g) In this reaction, enough energy is produced to ignite the hydrogen, creating a lilac flame above the potassium. If rubidium or caesium react with water though, the subsequent explosion tends to be very violent, a fact not helped by its rapidity in coming about once the metal and water start reacting." Source and further information: http://en.wikipedia.org/wiki/Alkali_metal Alkali Metals And Water http://www.metacafe.com/watch/178735/alkali_metals_and_water/
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Sodium is the best, and funniest, example (given that we consume it every day in the form of table salt)
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Potassium does. I remember that experiment in science.
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Wicked witches of the west, or was it east?
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