Presentation on theme: "Alkali Metals Group 1 Metals Or Li Na K Rb Cs Fr Squeaky pop!!"— Presentation transcript:
1 Alkali Metals Group 1 Metals Or Li Na K Rb Cs Fr Squeaky pop!! Mr R. Tucker (PP02_2005)
2 Which Group? Q ….Where are they in the Periodic Table?? A… Group 1Mr R. Tucker (PP02_2005)
3 Are Alkali Metals Hard ? Sodium Lithium Pottasium Alkali Metals are SOFT when cut, producing a shinny surface, which QUICKLY tarnishes in air.Pottasium
4 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 HydroxideAlkali metals are:Metals found in group 1 of the periodic tableSoft when cut (compared to other metals)Metals with low melting points and densitiesMetals 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
5 Similar Reactions of alkali metals with water ChangesActivityLithiumFloats, fizzes, releases hydrogen, moves about, alkali formedThird place3rdSodiumAs before, but metal melts to a beadSecond place2ndPotassiumAs sodium, but hydrogen gas burns with a lilac flame, can explode on water surfaceFirst place1stMr R. Tucker (PP02_2005)
6 Increasing atomic number Alkali MetalsIn order of increasing atomic number the alkali metals are:LithiumSodiumPotassiumRubidiumCaesiumFranciumIncreasing atomic numberMr R. Tucker (PP02_2005)
7 Alkali Metals - increasing reactivity down a metal groups In order of increasing atomic number the alkali metals are:LithiumSodiumPotassiumRubidiumCaesiumFranciumIncreasing atomic sizeOutermost shell electrons are farther away from nucleusMore easily lostMr R. Tucker (PP02_2005)
8 Flame colours of alkali metal compounds Flame colour seenLithium compoundsRedSodium compoundsBright yellowPotassium compoundsLilacMr R. Tucker (PP02_2005)
9 Reactivity These elements are highly reactive metals. The reactivity increases on descending / going down the Group from lithium to caesium.
10 Videos on youtubeCutting Alkali metals and their reactions with in waterViolent Reaction (Explosion) of Alkali Metals with Water
11 What if the Most reactive metal element reacts with the Most reactive non-metal element in the periodic table?
12 What if the Most reactive metal element reacts with the Most reactive non-metal element in the periodic table?
13 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 hereWhat is the Most reactive non-metal in the periodic table?Fluorine
14 Reacting Fluorine with Caesium - First Time on Camera