C1-Periodic Table+Atomic Structure
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Define an atom
What everything is made up of
Define an element
Made of ONLY ONE type of atom
Define compound
MORE than ONE type of element chemically combined that cannot be separated
What does the group number tell us
How many electrons are on the outer shell
What does the period number tell us?
How many shells there are
What are group 1 called
Alkali metals
What is group 7 called?
Halogens
What is group 0 (8) called?
Noble gasses
What is the trend in reactivity for group 1
The most reactive at the bottom
What is the trend in reactivity in group 7
Most reactive at the top
What charge do protons,neutrons and electrons have?
Positive,neutral,negative
Name four seperation techniques?
Fillteration crystallisation distillation chromotography
Describe properties of metals
Ducktile(can be used as wires),sonorous(ringing sound when hit),malleable(can be shaped),lustorous (shiny) High melting point, high density,good conductors of heat snd electricity
Who discovered the periodic table?
Dimitri mendelev
Facts abt periodic table
Mendeleev left gaps in the table for undicovered elements,metals are on the left hand side of the staircase
What is the radius if an atim
1.0x10 to the minus 8
What is a solvent
A liquid in which a solid dissolves
What is a soluble solute
A solid that dissolves in a solvent
Who discovered atoms what year
John dalton 1803
Who discovered electron what year
JJ thomson 1897
Who dicovered protons what year
Ernst rutherford 1917
Who discovered neutron what year
James chadwick 1932
Plum pudding model
JJ thomson mass shared throughout pudding pudding is positive plums are negative (electrons) embeded in the pudding
Nucleur model
Ernst rutherford. Dissproved plum pudding model using gold foil expirement. All mass in nucleus of an atom nucleus is positive most of an atom is empty space negative charged orbit nucles