He recognised atoms of particular elements differ from other elements
1803
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What did J.J Thomson discover and when?
He recognised electrons as components of atoms
1904
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What did Earnest Rutherford discover and when?
He realised that the positive charge was located in the nucleus of an atom and the rest was mostly empty space after he did the alpha particle experiment.
1911
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What did Niels Bohr discover and when?
He discovered electrons orbit the nucleus in fixed shells.
1913
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What did James Chadwick discover and when?
He discovered the neutron and that it was found in the nucleus of an atom.
1932
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What was John Daltons model of the atom called?
Solid sphere model
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What was J.J Thomsons model of the atom called?
Plum Pudding model
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What was Earnest Rutherfords model of the atom called?
Nuclear model
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What was Neils Bohrs model of the atom called?
The Planetary Model
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How is the modern periodic table ordered?
By Atomic (Proton) number
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How many electrons are in the first the second then third then forth shell?
-2
-8
-8
-18
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What does electronic structure mean?
It tells us how many electrons there are in each shell around a nucleas.
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What are group 7 metals called?
Hallogens
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What types of molecuels are the hallogens?
Diatomic
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What happens when you go down the hallogen group?
The atoms get larger and they get less reactive
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How do you figure out the relative abundance?
Relative abundance=
(%isotope 1 x mass isotope 1) + (%isotope 2 x mass isotope 2) divided by 100
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Filtration
Separating an insoluble solid
from a liquid
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Crystallisation
To separate a solid from a
solution
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Simple distillation
To separate a solvent from a
solution
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Fractional
distillation
Separating a mixture of liquids
each with different boiling points
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Chromatography
Separating substances that move
at different rates through a
medium
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Rutherford's scattering
experiment
Most of the alpha particles
passed right through.
A few (+) alpha particles were
deflected by the positive
nucleus.
A tiny number of particles
reflected back from the
nucleus.
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Isotopes
Atoms of the same element
with the same number of
protons and different
numbers of neutrons
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Mixture
Two or more elements or compounds
not chemically combined together
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Other cards in this set
Card 2
Front
What did J.J Thomson discover and when?
Back
He recognised electrons as components of atoms
1904
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