Atoms
- Created by: JennD
- Created on: 28-05-16 09:14
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- Atom
- Atoms and Elelements
- The Nucleus
- Contains protons and electrons
- In middle of atom
- Protons are positively charged and neutrons have no charge so the nucleus is positively charged
- Very very small
- The Electrons
- Around the nucleus
- Negatively charged
- Occupy shells. These explain the periodic table
- Cover lots of area
- Atoms have no charge as the charge of the protons and electrons is the same and they are opposite the charges are cancelled out
- Is the atoms gains or loses a protons or electron is becomes charged meaning it's a ion
- The Nucleus
- Electron shells
- Rules
- Electrons always occupy shells
- The shell closest to the atom must be filled first before you move onto the next shell
- Only a certain number of electrons are allowed on each shell. 2-8-8 rule
- Atoms behave better and react less if they have a full outer shell
- Think noble gases. They are stable (unreactive)
- If doesn't have full outer shell the atom will react to fill it
- Rules
- Elements
- Elements only consist on 1 atom type
- They can be found in the periodic table
- It groups atoms of similar properties together
- How to find out the number of protons, electrons and neutrons
- On the periodic table you always have a mass number at the top and atomic number at the bottom
- Mass number is the mass of the nucleus (the protons and electrons)
- Atomic number tells you how many protons there are, which is the same as the number of electrons
- Number of neutrons= atomic number-mass number
- Mass number is the mass of the nucleus (the protons and electrons)
- Number of neutrons= atomic number-mass number
- Atoms and Elelements
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