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Number of Protons =




Number of Electrons





Number of Protons =




Atomic Number





Protons + Neutrons =



Atomic Mass









Chemistry Revision Atomic Structure

Atomic Structure

3 particles that make up an atom Neutrons, Electrons and Protons.


Electrons Protons Neutrons

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Very Light Weighs about the Each one has the
Arranged in shells same as a Hydrogen atom same mass as a
Outer particles of (1 amu or 1 atomic unit) Proton
an atom and take Found in the Nucleus Found in Nucleus
part in chemical Positive Charge Has no charge…

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So... Electrons are
NEGATIVE










The arrangements of electrons in atoms

Electrons are arranged in shells
Each shell represents a different energy level
Lowest energy level is nearest to the nucleus

Electrons have a negative charge Nucleus has a positive charge
Electrons are attracted to the nucleus

To move an electron…

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Reading the Electronic Structure on the Periodic Table
The diagram shows a section of the periodic table, with the elements arranged




as usual in the order of their atomic number, from 2 to 20. The red numbers
below each chemical symbol show its electronic structure.


Moving across each period, you…

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Although it comes after Group 7, it is not called Group 8 - and it contains
helium, which has only two electrons in its outer shell.)

Working out an element's electronic structure

Here is how to use the periodic table to work out an electronic structure:
Find the element in…

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The relative atomic mass (basically the Atomic Mass) of an element is the
average mass of all the atoms of that element.
The relative atomic mass of an element compares the mass of atoms of
the element with atoms of the Carbon-12 isotope, usually written as 12C.
Usually this is…

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