C3 Part 1 - The Periodic Table

Kayleigh Peek
Mind Map by Kayleigh Peek, updated more than 1 year ago
Kayleigh Peek
Created by Kayleigh Peek almost 6 years ago


AQA Additional Science Course Chemistry Part 1 -The Periodic Table (COMPLETED)

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C3 Part 1 - The Periodic Table
1.1 The periodic table
1.1.1 Atomic Number The number of protons in an atom of an element
1.1.2 Elements arranged in order of increasing atomic number
1.2 Alkali metals - 1
1.2.1 The more easily the outer electron is lost, the more reactive the Group 1 element is As you go down Group 1, electronic shielding increases - this means the "pull" on the outer electron from the nucleus is reduced The outer electron is also further away from the positive nucleus as you go down the Group
1.2.2 Density Density (gcm-3) = Mass(g)/Volume(cm3) Lithium - 0.53gcm-3 Sodium - 0.97gcm-3 Potassium - 0.86gcm-3 Rubidium - 1.53gcm-3 Lithium, Sodium and Potassium will all float on water as their density is less than water (1gcm-3)
1.2.3 Low densities
1.2.4 Soft
1.2.5 Low melting and boiling point As you go down Group 1 metals, the melting and boiling point of the alkali metals decrease Melting point Lithium - 180 Sodium - 97.8 Potassium - 63.5 Rubidium - 38.9 Caesium - 28.7 Francium - 27 Boiling point Lithium - 1330 Sodium - 890 Potassium - 774 Rubidium - 688 Caesium - 690 Francium - 680
1.3 Alkali metals - 2
1.3.1 Alkali metals reacting with air (oxygen) Sodium + Oxygen --> Sodium Oxide 4Na+ + O2- > 2Na2O
1.3.2 Alkali metals reacting with halogens to form Alkali metal Halides Sodium + Chlorine --> Sodium Chloride 2Na + Cl2 --> 2NaCl
1.3.3 Alkali Metals and water Sodium + Water --> Sodium Hydroxide + Hydrogen 2Na + 2H2O --> 2NaOH + H2
1.4 The Transition Elements
1.4.1 Centre block of Periodic table
1.4.2 High Densities, Hard, Strong
1.4.3 Do not react vigorously with water
1.4.4 Frequently used as catalysts
1.5 The Halogens
1.5.1 As you go up Group 7, the reactivity increases
1.5.2 Diatomic molecules formed (F2/Cl2/Br2/I2)
1.5.3 Weak intermolecular bonds between the diatomic molecules Low Melting point Low Boiling point
1.5.4 As you go down Group 7 the melting and boiling point increase due to the intermolecular bonding between the molecules become stronger as you go down Group 7
1.5.5 Iron + Chlorine --> Iron Chloride
1.5.6 Colour Fluorine - Pale Yellow Chlorine - Pale Green Bromine - Orange/Brown Iodine - Purple Vapour
1.6 Organising the Elements
1.6.1 Antoine Lavaiser Book Lists 33 elements Classifying them into gases, metals, non-metals and earths
1.6.2 Stanislac Connizzaro Worked out Atomic weights and listed them in a scientific paper
1.6.3 John Newlands 'Law of Octaves' Listed 56 elements in order of increasing atomic weight Every eighth element had similar properties
1.6.4 Dmitri Mendeleev Published first periodic table Elements in order of atomic weights In groups of similar properties Predicted the elements that hadn't been discovered yet
1.6.5 Johann Dobreiner Announced findings Elements come in groups of three Middle weight was and average of the lighter and heavier elements
1.6.6 Alexandre Chancourtois Discovered Elements with similar properties occur at regular intervals
1.6.7 Lothar Meyer Graph Volume of atom against atomic weight Noticed a pattern and deduced a periodic table

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