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kasyan Ch.3,4,5,8
Question | Answer |
---|---|
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 |