unit ii - chemistry in this unit we will discuss the elements of the periodic table, how elements...
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Unit II - Chemistry
In this unit we will discuss the elements of the periodic table, how elements combine to make molecules and the properties of elements and compounds
Today's Starter Quote
Don't put off living to next week, next month, next year or next decade. The only time you’re ever living is in this moment.
Hydrogen
Symbol : 11 H
Atomic mass : 1 amu Uses: light gas that
can be used as a fuel.
Check out the Video here
Helium
Symbol : 42 He
Atomic number 2 Uses: lighter than air,
often in balloons
Lithium
Symbol: 73 Li
Number of protons and electrons: 3
Uses: metal that is very reactive with water; part of some batteries
Video here
Beryllium
Symbol: 94 Be
Atomic mass: 9 amu Uses: lightweight
parts for missiles and spacecraft
Boron
Symbol: 115 B
Atomic number: 5 Uses: makes plastic-
like polymers like Silly Putty or burns with an interesting flame as boric acid
Carbon
Symbol: 126 C
Atomic mass: 12 (used a reference for all matter)
Uses: two forms – graphite in pencils or diamond!
Nitrogen
Symbol: 147 N
Atomic number: 7 Uses: makes up 78%
of our atmosphere; vital to living organisms
Oxygen
Symbol: 168 O
Atomic Number: 8 Uses: required for
cellular respiration as O
2; protects Earth
from uv rays as O3
Fluorine
Symbol: 199 F
Number of electrons: 9
Uses: Reacts violently with everything (even glass)! Check here
Neon
Symbol: 2010
Ne
Number of protons, electrons and nuetrons: 10
Uses: fluorescent lights (red)
Sodium
Symbol: 2311
Na
Atomic mass: 23 amu
Uses: reactive with water; component of table salt and ion channels
Magnesium
Symbol: 2412
Mg
Atomic mass: 24 amu
Uses: welding and old photography equipment
Aluminum
Symbol: 2713
Al
Uses: foil used for cooking, rims on car wheels
Silicon
Symbol: 2814
Si
Uses: computer chips, but not silicone – a plastic like substance
Phosphorus
Symbol: 3115
P
Uses: occurs in 3 forms – white (dangerous!), red and black; found in pyrotechnics
Sulfur
Symbol: 3216
S
Uses: also known as brimstone; smells just awful
Chlorine
Symbol: 3517
Cl
Uses: used as one of the first forms of chemical warfare; often used as bleach to disinfect
Argon
Symbol: 4018
Ar
Uses: Also in fluorescent lights – blue in colour!
Potassium
Symbol: 3919
K
Uses: part of fertilizer, very reactive with water; found in bananas
Calcium
Symbol: 4020
Ca
Uses: rare in pure form, but as a compound is key to bones and teeth
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