Important Elements
Hydrogen
Symbol: H
Atomic number: 1
Atomic Weight: 1.0079
Color: None
It is the most abundant element in the universe and
the source of everything in it.
Because hydrogen atoms are so simple, they are very
light.
They are lighter than air, so if you fill a balloon with
hydrogen, it will float up to the sky.
http://en.wikipedia.org/wiki/File:Hydroge
nglow.jpg
Oxygen
Symbol: O
Atomic Number: 8
Atomic Weight: 15.9994
Color: None
http://en.wikipedia.org/wiki/File:Liquid_Oxygen2.gif
Oxygen atoms make up almost a quarter of the air on Earth, and they're
necessary for all animals and people to breathe. Some oxygen atoms combine
with carbon atoms to make carbon dioxide so plants can breathe and
hydrogen atoms to make water molecules.
Chlorine
Symbol: Cl
Atomic Number: 17
Atomic Weight: 35.4527
Color: pale yellow-green gas
http://chemistry.about.com/od/elementfacts/a/c
hlorine.htm
Chlorine atoms join up easily with any
atom that has one extra electron. Sodium and chlorine atoms often join
together and make molecules of salt. Chlorine also easily combines with water
and form acid molecules made of oxygen, hydrogen and chlorine atoms, which
gives bleach. We use it to kill bacteria in water, to make it safe to swim in and
to drink.
IMPORTANT ELEMENTS-CONTINUED
Carbon
Symbol: Ca
Atomic Number: 6
Atomic Weight: 12.011
Color: dense, black
Carbon is found free in nature in 3 forms:
amorphous, graphite, and diamond.
http://www.historyforkids.org/sciencefo
Most of what we use for fuel is made of
rkids/chemistry/atoms/carbon.htm
carbon: Coal, gasoline, oil, and wood.
These are all made of hydro-carbons (molecules of hydrogen & water). If carbon
is pouring into the air it is causing global warming.
Neon
Symbol: Ne
Atomic Number: 10
Atomic Weight: 20.1797
Color: Colorless
The glow of Neon is a reddish orange color
when it is at plasma state. When it is at room
http://upload.wikimedia.org/wikipedi
a/commons/f/f8/Neon-glow.jpg
temperature, it does not have a color or odor
to it.
Neon is used to make neon signs ,gas lasers and it is also used in lightning
arrestors, television tubes, and high-voltage indicators.
Nitrogen
Symbol: N
Atomic Number: 7
Atomic Weight: 14.00674
Color: Colorless
http://en.wikipedia.org/wiki/Nitrogen
Eighty percent of Earth's atmosphere is
made of nitrogen gas. Plants and animals use nitrogen just like bacteria do, to
make amino acids and proteins. It can create very reactive compounds when
combined with other elements including hydrogen .
IMPORTANT ELEMENTS-CONTINUED
Magnesium
Symbol: Mg
Atomic Number: 12
Atomic Weight: 24.305
Color: silvery-white metal
http://en.wikipedia.org/wiki/File:Magnesium
Magnesium is light and relatively
_crystals.jpg
tough.
Finely divided magnesium ignites upon heating in air, burning with a
bright white flame.
Magnesium is essential for plant and animal nutrition. Chlorophyll is a
magnesium-centered porphyrin.
Aluminum
Symbol: Al
Atomic Number: 13
Atomic Weight: 26.981539
Color: silvery-white
Aluminum can be easily formed,
http://en.wikipedia.org/wiki/File:Aluminium4.jpg
machined, or cast. It is nonmagnetic and
nonsparking.
We can separate aluminum using huge amounts of electricity. We use a lot of
aluminum because it is light and easy to work, and it doesn't rust like iron.
Airplanes and soda cans are mostly made of aluminum.