A Matter of Fact

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A Matter of Fact

• Mixtures, Elements and Compounds

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HENRY MOSELEY
DEVISED THE MORDERN PERIODIC TABLE
ARRANGING ELEMENTS AS PER THEIR ATOMIC NUMBER.
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What is a Periodic Table?

• It is a tabular display of Chemical Elements.
• It is classified into Alkali Metals, Alkaline
  earth metals, transition metals metalloids,
  halogens, noble gases, rare earth metals

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PERIODIC TABLE
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ELEMENTS CATEGORY IN THE periodic table

Metals Metals Metals Metals Metals Metals Metalloids Nonmetals Nonmetals Nonmetals Unknownchemicalproperties
Alkali metals Alkaline earth metals Inner transition metals Inner transition metals Transition metals Post-transition metals Metalloids Other nonmetals Halogens Noble gases Unknownchemicalproperties
Alkali metals Alkaline earth metals Lanthanides sActinides Transition metals Post-transition metals Metalloids Other nonmetals Halogens Noble gases Unknownchemicalproperties
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What is a Periodic Table?

• It is a tabular display of Chemical Elements.
• It is classified into Metals, alkaline earth
  metals, metalloids, halogens, transition metals,
  noble gases, rare earth metals

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Metals

• Very reactive metals, do not occur freely in
  nature.
• Such metals are soft, malleable, ductile, good
  conductors of heat and electricity.
• Malleable - can be beaten into thin sheets.
• Ductile - can be stretched into wire.
• Possess metallic luster.
• Solid at room temperature (except Hg).
• Examples Lithium, sodium, potassium, copper,
  mercury

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• copper

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Non Metals

• Present in Group 14, 15, 16
• Exist in room temperature as gases (Oxygen) and
  solids (Carbon).
• Very brittle-if a solid
• cannot be rolled into wires (Nonductile).
• Cannot be pounded into sheets
• Cannot conduct heat and electricity, do not
  reflect light.
• Do not possess metallic luster.
• E.g Hydrogen, Nitrogen, Carbon, Oxygen

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Noble Gases

• Present in Group 18 of the periodic table.
• Very low reactivity
• colorless, odorless, tasteless
• This group has lots of uses.
• E.g helium, neon, Argon, Krypton, Xenon, Radon.
  

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neon and helium or argon -- used In light bulbs.
Laser lights
Xenon headlights are found in BMW cars
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TASK

• Download the tasks from the website
• Atomic Wksht 1
• Atomic Wksht 2