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This is a link post Lets try Ceasium........
I've no doubt most have seen these sorts of reactions before, but I remember this exact one from my School days, I found it fascinating at the time and love the matter of fact way he suggests the 5th metal!

GC Be damned!
 (I helped save b3ta! Si o doom Fund me! No catering cost involved! bit.ly/1bFtzN2, Tue 7 Jun 2011, 15:24, Reply)
This is a normal post :¬D
Makes you wanna try Francium...

Also, lo and behold, your students have been thoroughly taught the alkali metals, and are likely to remember them.
 (I helped save b3ta! Lord Keeps meaning to procrastinate., Tue 7 Jun 2011, 15:27, Reply)
This is a normal post I've always loved science-y stuff anyways,
Throw in a few explosions and I'm totally sold!
 (I helped save b3ta! Si o doom Fund me! No catering cost involved! bit.ly/1bFtzN2, Tue 7 Jun 2011, 15:44, Reply)
This is a normal post from memory
i think it's almost impossible to actually have Francium as it reacts so quickly almost everything...

I do love this video, takes me back to 2nd year high school chemistry
 (Clashrock is being stalked by his brother on, Thu 9 Jun 2011, 12:14, Reply)
This is a normal post "Things gradually become more terrifying as we go down the group" :)

(Pie of Meat ___°¬¯O¯____\o/_____/\_,____Y¯¯Y, Tue 7 Jun 2011, 15:31, Reply)
This is a normal post Just like Abba.........
Oh wait, you said go down the group, not on..........
 (I helped save b3ta! Si o doom Fund me! No catering cost involved! bit.ly/1bFtzN2, Tue 7 Jun 2011, 15:46, Reply)
This is a normal post Try and get this out of your head after watching
www.youtube.com/watch?v=ljsUVDOcYB0&feature=player_embedded
 (I helped save b3ta! The Scrunt Wants a Dozen Pints, Tue 7 Jun 2011, 15:37, Reply)
This is a normal post A Japanese cover of Tom Lehrer?
I love the internet...
 (I helped save b3ta! H.B.Mupps, Tue 7 Jun 2011, 17:25, Reply)
This is a normal post Note this down in your copybook.........................................................................NOW!
I actually remember watching this exact video too
 (I helped save b3ta! Rebel biscuit stercore sumus et nos esse novimus, Tue 7 Jun 2011, 16:14, Reply)
This is a normal post I remember this one too.
I guess that either means that this particular video was much better than all the others or they were the ones willing to try it!
 (I helped save b3ta! benryves Now I'm radioactive! That can't be good!, Tue 7 Jun 2011, 16:22, Reply)
This is a normal post I too remember this!
Felt disappointed after that we not allowed to try this out ourselves.
 (I helped save b3ta! Cerebus Sticky! Sticky! Stick! Stick!, Tue 7 Jun 2011, 16:30, Reply)
This is a normal post I remember this video
I also remember a truly awesome science teacher called Miss Penfold (i think) who got hold of some lithium, placed the giant petri dish thingy with water in it ON TOP OF the overhead projector, then put drops of food colouring in and projected the trippy whizzing around lithium on the classroom wall.

it was awesome, best science teacher ever. Though she failed to teach me what the name of the big glass petri thingy is actually called.

Also the day before a "meet the teachers" parents evening she accidentally set fire to her classroom ceiling with magnesium powder.
 (I helped save b3ta! KittyWaste lives at Sleepingplanet.com, Wed 8 Jun 2011, 0:55, Reply)
This is a normal post Sounds fantastic.
My sister is a science teacher, I'll suggest that she do this (if they even have overhead projectors these days).
 (Dick Champion, Fri 10 Jun 2011, 0:36, Reply)
This is a normal post Yay, classic chemistry! I remember watching this exact video too.
Anyone wondering why they didn't use Francium: it's radioactive and extremely rare. At any one time there's about 20g of it in the whole Earth - so it's not something you'll find in the lab store cupboard.
 (I helped save b3ta! the wub - guide onion for the blind, Thu 9 Jun 2011, 12:48, Reply)