Table of contents | |
Introduction | |
Parts of the Atom | |
Electron Structure | |
Electrons & Protons |
Tip: There are many different models of the atom. As you progress through the topic you will discover that the atom can be described in many different ways, such as the Plum Pudding Model that is covered later, but for your exam, make sure to only use the model and descriptions described here!
Be careful with your terminology:
- Atom = nucleus (proton and neutron) and electrons
- Nucleus = protons and neutrons at the centre of the atom
Tip: If you are studying for your Chemistry GCSE then you will need to know the number of electrons that fit into the different energy levels. They may also be called electron shells.
Example: A nucleus of carbon-12 is shown below.
How many electrons are there in an atom of carbon-12?
Step 1: Count the number of protons in the carbon nucleus
- There are 6 protons in the carbon atom
Step 2: Determine the number of electrons
- Remember, the number of electrons in an atom is equal to the number of protons
- Therefore there must be 6 electrons in the carbon atom
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