The document discusses the periodic table, which organizes the chemical elements based on their atomic structure and properties. It explains that Dmitri Mendeleev created the periodic table by arranging the known elements in order of atomic weight and leaving gaps for elements that had not yet been discovered. Examples are given of three elements - cerium, oxygen, and hydrogen - including their atomic properties and common uses.

1. THE PERIODIC TABLE
Crystal Miller

2. What is it??
There periodic table is a table
of chemical elements.
Elements are placed in specific locations based on the
way they look, and they way they act.
The periodic table is so useful for our chemists today.
It makes it easier to compare properties
of one element to another.

3. How exactly is it organized??
All the rows that
go from left to
right are called
periods.
All the columns
are called groups
If the elements are in the same period, they have the same amount of atomic orbitals.
And if the elements in the same groups have the same amount of valence electrons.

4. Who created the periodic table?
It was created by Dmitri Mendeleev.
-Dmitri noticed when he laid out the elements according
to atomic weight, that some chemical properties were
repeated.
-Although, not all the elements fit the pattern. So he
moved some of the elements to another place(regardless
of their weight) so that they could still group them with
other elements with similar properties.
- Soon the periodic table got revised and was made
according to atomic number, and the elements fell into
place.

5. Element Example One
-Cerium
atomic number: 58
Symbol: Ce
Atomic Mass: 140.12
-This is a rare metal.
-It slowly decomposes in cold water, and rapidly in
hot water.

6. Element Example Two
Oxygen,
Atomic number: 8,
Atomic symbol: O
Atomic mass: 15.999
its responsible for energy production.

7. Element Example Three
Hydrogen,
atomic number: 1,
Atomic symbol H,
atomic mass:1.008,
-hydrogen as water, hydrogen gas is used in hot air baloons.

8. Sources:
http://www.factmonster.com/ipka/A0905215.html
http://www.webelements.com/
http://www.chemistry.co.nz/mendeleev.htm