The periodic table
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The Periodic Table. Dimitri Mendeleev was the Russian scientist who developed the modern Periodic Table The Periodic Table is an arrangement of all elements in order of atomic number. Groups (family). A column in the periodic table Elements have similar properties. Periods.

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The periodic table
The Periodic Table

  • Dimitri Mendeleev was the Russian scientist who developed the modern Periodic Table

  • The Periodic Table is an arrangement of all elements in order of atomic number.


Groups family
Groups (family)

  • A column in the periodic table

  • Elements have similar properties


Periods
Periods

  • A row on the periodic table

  • Elements in the same period have the same number of electron rings


Element
Element

  • A pure substance made of only 1 kind of atom.

  • Cannot be broken down into any other substance.

  • Refer to p 604-605 in textbook


Hydrogen
Hydrogen

  • Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in the universe

  • It is estimated that 90% of the visible universe is composed of hydrogen.

  • Hydrogen is the raw fuel that moststars 'burn' to produce energy.


Properties of elements
Properties of Elements

  • An element’s physical and chemical properties can be predicted by its location on the periodic table.


Physical properties
Physical Properties

  • Are observed by using the senses and can be determined without destroying the object

    Color Odor

    Shape Density

    Length Mass


Chemical properties
Chemical Properties

  • Indicates how a substance will react with something else

  • Can be observed only during a chemical change


How elements are represented
How Elements Are Represented

  • Elements are represented by symbols

  • Symbols start with 1 capital letter and can be followed by 1 or 2 lower caseletters

N

Uuq

Ca


Elements in air
Elements in Air

78% Nitrogen

21% Oxygen

1% other gases


Elements in living matter
Elements in Living Matter

  • Hydrogen- most abundant because of water in living things

  • Oxygen

  • Carbon


Elements in land
Elements in Land

  • Oxygen 46%

  • Silicon 27%

  • Aluminum 8%

  • Iron 5%

  • Other Ca, Na, K, Mg


Elements in the ocean
Elements in the Ocean

  • Hydrogen (twice as much as oxygen)

  • Oxygen

  • Sodium

  • Chlorine

H2O

NaCl


Compounds ref p 28
Compounds (ref.p.28)

  • A new substance made when 2 or more different elements chemically combine

  • The properties of the new substance are different from the original properties

  • Elements occur in a set ratio represented by a formula


Formula

NH3

FORMULA

C6H12O6

  • Tells the recipe for the molecules in the compound by using symbols and subscripts

  • The symbol tells the element

  • The subscript number tells how many of each atom in the molecule.

  • Molecules come together to make the compound



Find the compounds
Find the Compounds

  • Water Iron

  • Silicon Nitrogen

  • Oxygen Salt

  • Carbon Dioxide Sugar


Find the picture of an element find the picture of a compound
Find the picture of an element.Find the picture of a compound.

B

A

C