ATOMS

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  • Created by: 13crossi
  • Created on: 29-06-16 11:12
What is atomic number?
The atomic number of an atom is the number of protons in an atom
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What is atomic mass?
Atomic mass is the total umber of protons plus neutrons.
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What is an isotope of an element
An isotope is the same element but with a different number of neutrons.
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What is an atoms overall charge?
An atoms overall charge is neutral as the number of positively charged protons is equal to negatively charged electrons.
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What is the symbol for a carbon isotope
C-12
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How do you work out the number of neutrons in a atom?
You minus the atomic number from the atomic mass.
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How are electrons arranged?
Electrons are arranged in energy shells around the atom ( discrete energy levels) .
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What's the maximum capacity of electrons on each shell?
2 electrons on the first, 8 on the second and third and 2 on the fourth.
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What group would Fluroine be in if. (Flourine has 9 electrons)
Fluroine would be in group 7 as it has seven electrons on the outside shell.
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What were John Datons main 5 conclusions?
1. All matter is made of Atoms 2. Atoms cannot be broken down into anything simpler. 3.All atoms of a particular element are identical 4.Atoms are rearraged in a chemical reaction 5.Compounds are formed when two or more atoms join together
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Who discovered the electron and when?
Thompson discovered the electron in 1897
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Who concluded that the atom must contain a smaller nucleus?
Ernest Rutherford concluded this in 1911
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Who discovered electron orbits/shells?
Bohr concluded that electrons must occupy particular orbits around an atom
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What was Geiger and Marsdens experient?
A beam of Alpha particles was fired at a thin gold foil. Some Alpha particles emerged at different points and some came straight back.
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What did Geiger and Marsden conclude?
As some Alpha particles were repelled and some came out at different angles they concluded that there must be a small concentration of positive charge inside the atom.
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What is the radius of a typical atom?
10-10m
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What is the mass of a typical atom?
10-23g
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What is the electronic configuration of Sodium?
2.8.1
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Other cards in this set

Card 2

Front

What is atomic mass?

Back

Atomic mass is the total umber of protons plus neutrons.

Card 3

Front

What is an isotope of an element

Back

Preview of the front of card 3

Card 4

Front

What is an atoms overall charge?

Back

Preview of the front of card 4

Card 5

Front

What is the symbol for a carbon isotope

Back

Preview of the front of card 5
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