Chemistry C3 Revision Notes - OCR Higher

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  • Created by: mara
  • Created on: 21-01-13 14:16

THE ATOMIC STRUCTURE

Proton + 1
Neutron 0 1
Electron - 1/2000

Atoms are neutral

Isotopes
-atoms of the same element with a different mass

For every 4 atoms of chlorine, 1 is heavier.

What makes atoms reactive?
-They want to obtain a full outer shell.

(http://www.bbc.co.uk/schools/gcsebitesize/science/images/diag_hydrogen_2.gif) <---Shared Pair of electrons from each Hydrogen atom.

H-H or H2

(http://www.bbc.co.uk/schools/gcsebitesize/science/images/diag_water.gif) <--Sharing of electrons between two Hydrogen molecules and one oxygen, to make water.

H-O-H or H20

(http://www.bbc.co.uk/schools/gcsebitesize/science/images/diag_methane.gif)<--- Sharing of electrons between 4 hydrogen atoms, and one carbon atom, creating methane.

CH4 or H
|
H - C - H
|
H

(http://www.bbc.co.uk/schools/gcsebitesize/science/images/diag_oxygen_2.gif)<--- In Oxygen a double bond is used (the sharing of two pairs of electrons)

O2 or O=O

GROUP 1 METALS - ALKALI

Li - Lithium
Na - Sodium
K - Potassium
Rb - Rubidium
Cs - Caesium

They increases in size (mass) as you go down the group.
Eg. Caesium has a bigger mass than lithium.

As they increase in

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