The modern periodic table E lements are arranged according to atomic number

The modern periodic tableElements are arranged according to atomic number

Periods = horizontal rows of elements

Group (family) = vertical column of elements with similar properties

Zig zag line = separates metals from nonmetals

Br

Ca

Fe

H

C

Cl

Mg

PZn

Why the periodic table works?

It works because it's based on the structure of the atoms, especially the valence electrons.

All the elements in a family all have the same number of valence electrons.

http://www.echalk.co.uk/Science/chemistry/periodicTableGame/periodicTable.html

Across the top are numbers 1-18. These numbers help to identify the group number. They help to determine the Valence electrons.

The Periodic Table is a map to help explain elements and their characteristics.

Along the sideare numbers 1-7.These numbers are known as period numbers. They help to determine the number of shells for electrons around the nucleus.

The elements on the periodic table are the average of that type of element. The most common form.

Mg

24.305

Magnesium

12

Periodic Cell Block: What can you find out?Identify the information in the periodic cell block, drag up the words to complete the columns.

atomic number

symbol

atomic mass

number protons

number of protons + neutrons

Name of the element plus the atomic mass value: Mg 24 or Magnesium 24

What is it? Helps to identify .....

name

Uranium

92

U

239.029

Protons:Neutrons:Electrons:Name of element:

92

147

92

Uranium 239

Uranium for nuclear energy provides about 4% of the world's non-renewable energy.

Majority of the world supply of Uranium is mined in Australia and exported to other countries.

ELEMENTS IN A COMPOUND

A compound is formed by combining 2 or moreelements.

Think about this...the compound words such asbutterfly, doghouse, and clockwise are formed byadding together 2 smaller words.

They are very different from butter and fly, dog and house, and clock and wise!

MOLECULES

OH

H

O

H

+ =

HYDROGEN + OXYGEN = WATER

MOLECULES ARE THE SMALLEST UNIT OF A COMPOUND.(Remember a compound is formed by combing 2 or more elements.)