Left gaps for undiscovered alerts and pradicted the propersas of these elements later groves
Put elements to groups vertical and periods)
Modern Periodic Table
Elements are ordered by increasing atomic number (ie number of proton)
There is now a transition element block and noble gasses
Noble Gases group 8/0
Have been added
Element
Contains one type of atom and it cannot be broken down into anything simple by chemical means
Arrangement of the Periodic Table
Groups run vertically
Periods run horizontally
Metals are found to the left of the steps' and non-metal to the right
States of elements in the periodic table
Metals are all solids at room temperature (except mercury)
There are only two liquid elements: mercury and bromine
There are several gaseous elements: all the Noble Gases, fuorine, chlorine, oxygen, nitrogen and hydrogen
The rest of the elements are all solids
Metal properties
Melting Point/Boiling Point: High
Malleability: Good-can be hammered or bent into shape
Ductility: Good-can be stretched into a wire
Sonority: Can be good-make a ringing sound when struck
Conduction of heat and electricity: Good
Non-Metal properties
Melting Point/Boiling Point: Low (except for graphite and diamond)
Malleability: Poor-usually brittle
Ductility: Poor
Sonority: Not sonorous
Conduction of heat and electricity: Poor
Groups in the Periodic Table
Group 2: Alkaline Earth Metals
Group 0/8: Noble Gases
Group 7: Halogens
Group 1: Alkali Metals
Transition Metal Block
Group numbers give the number of electrons in the outside shell-group 7 will have 7 electrons in their outer shells and so will all react in similar ways
