GCSE AQA Chemistry Atomic Structure

These notes cover atomic structure, i made them for my year 10 end of year exams

hope they help :)

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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
reactions Charge = 0 Charge = +1
Negative Charge
Charge = -1
The middle of an atom Nucleus
Contains two types of particles Protons and Neutrons
Third type of particle orbits the nucleus Electrons
Protons…read more

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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 can see that the number of occupied
energy levels is the same as the period number.
As you go across each period from left to right, an energy level gradually
becomes filled with electrons.…read more

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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.…read more


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