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
Gold
Symbol: Au
Atomic Number: 79
Atomic Weight: 196.9665
Color: metallic yellow
Gold is the most malleable and ductile metal
and it is a good conductor of electricity and
heat. Gold is used for jewelry, dental work,
plating, and reflectors and in coinage.
http://chemistry.about.com/od/el
ementfacts/a/gold.htm
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 Most
http://www.historyforkids.org/sciencefo
of what we use for fuel is made of carbon:
rkids/chemistry/atoms/carbon.htm
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.
Iron
Symbol: Fe
Atomic Number: 26
Atomic Weight: 55.847
Color: ductile, silvery metal
http://jumk.de/mein-pse/eisen.jpg
The Earth's core is probably mostly made of iron, while Earth's crust is
about ten percent iron.Iron looks black to us when it is on its own, and it
looks red to us when it joins up with oxygen. That's why blood looks red.
Unlike other atoms, iron can become magnetic.