Atomic Structure and the Periodic Table
- Created by: Gabriella Vine
- Created on: 08-05-18 14:25
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Atoms, Elements, Compounds and Mixtures
Atoms, Elements and Compounds:
- All substances are made of atoms
- An atom is the smallest part of an element that can exist
- An element is a substance that contains only one sort of atom
- There are about 100 different elements
- Elements are displayed in the periodic table
- The atoms of each element are represented by a different chemical symbol, e.g. sodium = Na, carbon = C and iron = Fe
- Most substances are compounds
- A compound contains atoms of two or more elements, which are chemically conbined in fixed proportions
- Compounds are represented by a combination of numbers and chemical symbols called a 'chemical formula'.
- Scientists use chemical formulae to show:
- The different elements in a compound
- How many atoms of each element on molecule of the compound contains
- For example:
- Water, H2O, contains 2 hydrogen atoms and 1 oxygen atom
- Sulphuric acid, H2SO4, contains 2 hydrogen atoms, 1 sulfur atom and 4 oxygen atoms
- Compounds can only be seperated into their…
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