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kasyan Ch.3,4,5,8

QuestionAnswer
1870 William Crookes "threw" atoms at a fosflourescent material and found they glowed
1896 Henri Becguerei discovered radioactivity by placing uranium on a piece of film and there was a spot left. He then figuered out that rays are coming out of the uranium= radio activity
1897 JJ Thomson proved the existence of electrons and created the plum pudding model of an atom then in 1907 he found the proton
1904 Hantaro Nagoaka says atoms are like the solar system and said thomsom was wrong
1909 Earnest Rutherfurd Tried to prove Thomson is right. his plan was to use Crookes device and would shoot radium at it; he then would see it light up and count the atom particles. When he tried almost all of the atoms went to the same place
1913 Neils Bohr came up with the next model- the quantam model- predicts the shapes of moulecules aswell
1919 Francis Anston Discovered Isotopes
Isotopes same atom that differs in mass
1932 James Chadwick discovered the nuetron which explains isotopes *remember James (aka Jimmy) found the nuetron
atomic number The number of protons in an atom
How many protons, nuetrons, electrons are in: oxygen 8,8,8
How many protons, nuetrons, electrons are in: sodium 11,12,11
How many protons, nuetrons, electrons are in: lithium 3,4,3
A+B -> AB synthises
AB -> A+B decomposition
A+BC -> B+ AC single replacement method
AB+CD -> CB+AD double replacement method
elements something composed of one type of matter. Cannot be seperated into simpler materials by chemical means
molecule two or moreatoms bound together chemically
compound two or more different elements combined together chemically
mixture two or more substances that are bound together non chemically
inert an element that doesnt react with other elements
ions electrically charged atoms
the proton is bigger than the electron
valence number combining tendency of an element
Created by: Sarahmurray