C4- Atomic Structure- OCR Gateway

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  • Created on: 01-05-13 20:22
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C4- Atomic Structure
At the centre of an atom is a nucleus
containing protons and neutrons. Electrons
are arranged around the nucleus in energy
levels or shells. Make sure you can label a
simple diagram of an
Important Facts
Neutrons are neutral 0
Electron are negatively charged -1
Protons are positively charged +1
The number of protons in an atom, is the ATOMIC NUMBER
The total number of protons and neutrons in an atom is called the ATOMIC MASS
The total number of electrons in an atom is the SAME as the same number of
protons in the nucleus
An example......
6 protons because the bottom number is 6
6 electrons because the number of protons and electrons is the same
The total number of protons and neutrons in the carbon atom is 12

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ISOTOPES
what are they?
Isotopes are atoms with the same number of protons and electrons, but differ in the
number of neutrons, therefore they have a different mass.
Some examples......…read more

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Energy Shells and Electronic structure
Electrons are arranged in different shells around the nucleus
Each shell has a different capacity of the number of electrons it can hold, we can see that
from this table
Energy shell Maximum number of electrons
First 2
Second 8
Third 8
If an atom atom of an element has the electronic structure of 2 . 8 . 6 then it is in the third
row of the periodic table.
2 . 8 .…read more

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