Unit 1 Matter and Bonding. CHEMISTRY. Why do I have to study chemistry?. Atomic Theory. All elements are composed of atoms Each element contains similar atoms Atoms of one element are different from ones from another Two or more different atoms bond together to form a compound.
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Unit 1Matter and Bonding
Why do I have to study chemistry?
ParticleSymbol Charge Relative
Electron e--1 ~0
Proton p++1 1
Neutron n0 1
1. Carbon2. Sodium3. Aluminum
4. Copper5. Sulfur6. Iodine
C carbon Cocobalt
P Phosphorus Cacalcium
Ba BariumMg magnesium
Some elements are composed of two atoms bonded together
Whenever you write the symbol for these elements a subscript must be written
O P Zn
Energy levels are like using a stick shift in a car. The faster you travel the higher gear you use.
A Bohr model of Nitrogen.
n =12(1)2 = 2
n =22(2)2 = 8
All the elements in a group have the same electron configuration in their outermost shells
Example: Group 2
Mg 2, 8, 2
Ca 2, 2, 8, 2
Bohr and Lewis Review
Electrons with the greatest energy
Electrons that will react to form compounds
Draw the Bohr Diagram for Al
Draw the Lewis Diagram for O
Draw the Lewis Diagram for the compound formed between Al and O. Name it.
Isotopes of chlorine
chlorine 35 chlorine 37
mass isotope1(%) + mass isotope2(%) + …
Isotopes Mass of Isotope Abundance
24Mg =24.0 u 78.70%
25Mg = 25.0 u 10.13%
26Mg = 26.0 u 11.17%
Atomic mass (average mass) Mg = 24.3 u
Gallium is a metallic element found in small lasers used in compact disc players. In a sample of gallium, there is 60.2% of gallium-69 (68.9 u) atoms and 39.8% of gallium-71 (70.9 u) atoms. What is the atomic mass of gallium?
A sample of boron consists of 10B (mass 10.0 u) and 11B (mass 11.0 u). If the average atomic mass of B is 10.8 u, what is the % abundance of each boron isotope?