Alkali Metals Group 1 Metals Or Li Na K Rb Cs Fr Squeaky pop!!

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Presentation transcript:

Alkali Metals Group 1 Metals Or Li Na K Rb Cs Fr Squeaky pop!! Mr R. Tucker (PP02_2005)

Which Group? Q ….Where are they in the Periodic Table?? A… Group 1 Mr R. Tucker (PP02_2005)

Are Alkali Metals Hard ? Sodium Lithium Pottasium Alkali Metals are SOFT when cut, producing a shinny surface, which QUICKLY tarnishes in air. Pottasium

Properties of Alkali Metals All alkali (group 1) metals react violently with water, forming Hydrogen gas and Hydroxides (pH above 7): ie., Lithium + Water  Hydrogen + Lithium Hydroxide Alkali metals are: Metals found in group 1 of the periodic table Soft when cut (compared to other metals) Metals with low melting points and densities Metals which tarnish in air (form white oxides with oxygen) Question: Why are alkali metals stored under oil? A.. They react with water in the air

Similar Reactions of alkali metals with water Changes Activity Lithium Floats, fizzes, releases hydrogen, moves about, alkali formed Third place 3rd Sodium As before, but metal melts to a bead Second place 2nd Potassium As sodium, but hydrogen gas burns with a lilac flame, can explode on water surface First place 1st Mr R. Tucker (PP02_2005)

Increasing atomic number Alkali Metals In order of increasing atomic number the alkali metals are: Lithium Sodium Potassium Rubidium Caesium Francium Increasing atomic number Mr R. Tucker (PP02_2005)

Alkali Metals - increasing reactivity down a metal groups In order of increasing atomic number the alkali metals are: Lithium Sodium Potassium Rubidium Caesium Francium Increasing atomic size Outermost shell electrons are farther away from nucleus More easily lost Mr R. Tucker (PP02_2005)

Flame colours of alkali metal compounds Flame colour seen Lithium compounds Red Sodium compounds Bright yellow Potassium compounds Lilac Mr R. Tucker (PP02_2005)

Reactivity These elements are highly reactive metals. The reactivity increases on descending / going down the Group from lithium to caesium.

Videos on youtube Cutting Alkali metals and their reactions with in water https://www.youtube.com/watch?v=uixxJtJPVXk Violent Reaction (Explosion) of Alkali Metals with Water https://www.youtube.com/watch?v=HvVUtpdK7xw

What if the Most reactive metal element reacts with the Most reactive non-metal element in the periodic table?

What if the Most reactive metal element reacts with the Most reactive non-metal element in the periodic table?

What if the Most reactive metal element reacts with the Most reactive non-metal element in the periodic table? What is the Most reactive metal in the periodic table? It should be Francium, but Fr is radioactive and is extremely difficult to be used in laboratory experiment (half-life is 22 min). Instead Caesium is used here What is the Most reactive non-metal in the periodic table? Fluorine

Reacting Fluorine with Caesium - First Time on Camera https://www.youtube.com/watch?v=TLOFaWdPxB0