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Transcript of Elements #1-7
Elements of the planet #1-7
h2o is the most common hydrogen molucule. H2 stands for 2 hydrogen atoms and o stands for one oxygen atom.
Each water molecule has 2 hydrogen atoms in it.
one of the so-called noble gasses.
Element #3 :
lithium is a solid but only half as dense as water and lithium metal is the least dense metal.
beryllium is a metal and has a high melting point.
boron is borderline between metals and non-metals.
found in abundance in the sun, stars, comets and atmospheres of most planets.
Another thing made of hydrogen is hydrogen peroxide.
hydrogen peroxide can be used to whiten teeth.
hydrogens atomic number is 1 and the atomic mass is 1.008.
hydrogen is a gas.
hydrogens symbol is H.
helium is unreactive,colourless,and odurless.
first most abundant element in the universe.
second most adundant element after hydrogen.
helium is used in lighter than air balloons,and while heavier than hydrogen, is far more safer since helium does not burn.
speaking after breathing an atmosphere rich in helium results in a squeaky voice.
heliums atomic number is 2 and the atomic mass is 4.003
heliums symbol is HE
second most abundant element in the universe.
a freshly cut chunk of lithium is silvery,but tarnishes in a minute or so to to give a grey surface.
lithium is mixed with alumiminum and magnisium for light-weight alloys, and is also used in batteries, some greases,some glasses, and medicine.
lithiums atomic number is 3 and the atomic mass is 6.941.
lithiums symbol is LI
at ordinary temperatures , beryllium resists oxidation in air.
beryllium compounds are very toxic
discovered by Nicholas Louis Vauquelin.
discovered by Johan August Arfvedson.
discovered by Sir William Ramsay
discovered by Henery Ravendish.
berylliums atomic number is 4 anf the atomic mass is 9.012.
beryliums symbol isBe.
chemically closer to silicon than to aluminum, gallium, indium, and thallium
discovered by Sir Humphery Davy.
borons atomic number is 5 and the atomic number is 10.811.
Borons symbol is B
carbon is found free in nature in three allotropic forms:amorphous, graphite, and diamond.
carbon, as microscopic diamonds, is found in some meterorites.
discovered by known
carbons atomic number is 6and the atomic mass is 12.011.
carbons symbol is C