Chemistry - protons, neutrons and eletrons
- Created by: Bethany Charlotte 2015
- Created on: 21-06-15 13:34
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- Chemistry - protons, neutrons and electrons
- electrons orbit the nucleus.
- Shells of an atom represent different energy levels.
- Electrons occupy the lowest energy level possible.
- group eight or zero - unreactive and are stable.
- when elements form bonds they are trying to become stable - either have to gain or lose electrons.
- Two types of bond making
- Ionic bonding - a bond between a metal and a non metal. Metal looses an electron and non metal gains one.
- Both particles are called ions.
- Metal ions form positively charged ions and non metals form negatively charged ions.
- Covalent bonds - formed between atoms in non metals. They share bonds. Outer most shells overlap.
- No ions are formed instead molecules are formed.
- Ionic bonding - a bond between a metal and a non metal. Metal looses an electron and non metal gains one.
- Law of conservation of mass - mass cannot be created or destroyed.
- atoms have a net neutral charge.
- contains positive protons and negative electrons.
- negatives cancel out the positives.
- periodic table represents the different elements.
- Periodic table is international - understood by scientists of different languages
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