Atomic Theory
- Created by: AConfusedDuck
- Created on: 29-11-17 17:30
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- Atomic Theory
- Periodic Table
- Elements arranged in order of increasing atomic number
- Horizontal rows are called periods
- Share number of energy levels occupied.
- Vertical rows are called groups
- Share properties and number of electrons on outer energy levels and same valency.
- Key Groups an Properties
- Alkali metals
- Group 1
- React rapidly with water to produce a alkaline solution and water
- More reactive as you go down the group.
- Metal
- Valency of 1
- Halogens
- Group 7
- Diatomic- naturally found in pairs
- Become less reactive as one goes down the group.
- Valency of 1
- Found in gaseous (chlorine), liquid (bromine), and solid (Iodine) states
- Found in gaseous state.
- Noble Gases
- Group 8
- Valency 0
- Monatomic (exists as a single atom.
- Very unreactive
- Found in Gaseous state.
- Transition Metals
- Found between groups 2 and 3.
- Varying valency, represented by roman numerals.
- Dense
- Forms brightly coloured compounds
- Found in solid state with exception of mercury.
- Alkali metals
- Atomic Notation
- Element Symbol
- Atomic Mass
- Number of neutrons add number of protons.
- Atomic Number
- Number of Protons
- Charge
- Number of charge
- e.g. If there are two extra electrons, then the charge would be 2-
- If there were two fewer electrons, the charge would be 2+.
- e.g. If there are two extra electrons, then the charge would be 2-
- Number of charge
- Symbol, such as Na for sodium, etc.
- Atomic Mass
- Element Symbol
- Isotopes
- Same Atomic Number, but different Atomic Mass
- RAM
- Relative Atomic Mass
- Found in Data Book
- Atomic Mass, but takes into account abundancy of isotopes.
- e.g. If Chlorine 33 and Chlorine 34 were found in equal abundancy, the RAM would be Chlorine33.5
- Periodic Table
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