2 Introduction……The periodic table represents all of the known elements arranged in groups according to similar properties.Elements are arranged in the table in order of their atomic number.Each box contains the symbol, for the element, the name of the element and it´s atomic number.The atomic number of the element is the number of protons and the number of electrons in the atoms of the element.¡REMEMBER!The periodic table contains all of the naturally occuring and man-made elements
5 Alkaline Earth MetalsBoron ElementsCarbon ElementsOxygen ElementsNitrogen Elements
6 Hydrogen(Example 1)Hydrogen is the lightest element and can be used as a lifting agent in balloons.Since Hydrogen gas is highly inflammable, it can be dangerous to use.This property and others make Hydrogen suitable for use as a fuel.The most common use of Hydrogen is in chemical processes and reactions.
7 Alkaline MetalsAlkaline Metals have the following properties in common:They have low melting and boiling points compared to most other metals.They are very soft and can be cut easily with a knife.They have low densities (lithium, sodium and potassium will float on water)They react quickly with water, producing hydroxides and hydrogen gas.Their hydroxides and oxides dissolve in water to form alkaline solutions.
8 Potassium Alkaline - Expample 2 Properties Soft Reacts with air Fun fact.....Potassium chloride is usedin the lethal injections thatkill death row prisoners inthe USA.PropertiesSoftReacts with airStored in oilSilver in colourMelting point 63.38ºcBoiling point 759ºc
9 The Transition Elements The Transition Metals have the following properties in common:They form coloured compoundsThey are good conductors of heat and electricityThey can be hammered or bent into shape easilyThey are less reactive than alkali metals such as sodiumThey are usually hard and toughThey have high densitiesThey have high melting points-but mercury is a liquid at room temperature
10 All the gold in the world Transition Elements – Example 3PropertiesSoft for a metalCan be polished to a high shineResistant to corrosionGood conductor of electricityGood conductor of heatMelting point ºcBoiling point 2856ºcFun fact..All the gold in the worldhas a value of$5,681,937,512,522!
11 Halogen ElementsThe Halogen elements have the following properties in common:The halogens have similar propertiesThey all have seven electrons in the outer shell.They all react very vigorously with alkali metals to form salts.Halogen means salt giver
12 Chlorine Halogen Elements – Example 4 Properties Discovered in 1774 by Carl Wilhelm Scheele, who mistakenly thought it contained oxygen.Obtained from common saltMelting point ºCBoiling point ºCFun fact.....Chlorine has killed lives and saved them!In World War I & II it was used to kill people with the fumes.It is also used to purify water.
13 The Noble GasesThe Noble Gases have the following properties in common:The noble gases are quite unreactiveThey have low boiling pointsThey are gases at room temperatureYou can also find small amounts of the Noble gases in the atmosphere.Helium, neon and argon form no known compounds.
14 Helium Noble Gases – Example 5 Properties Helium has no taste, colour or smellThe gas is produced in massive stars like the sun where 4 hydrogen atoms fuse together.Melting point ºCBoiling point – ºC2nd lightest elemenet