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Elements
- A substance which cannot be split into simpler substances by chemical means. Building blocks of of chemical compounds.
- EXP.
- The four major elements of the human body are Oxygen (O), Carbon (C), Hydrogen (H), and Nitrogen (N).
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Atoms
The smallest unit of matter which retains the the propertites and charactoristics of the elements.
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Molecules
- Two or more atoms shareing electrons joined by a chemical bond.
- Can be 2 atoms of the same element: o2.
- Can be atoms of different elements: H2o.
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Compounds
- Molecules that contain atoms of different elements.
- Compounds H2o, NaCl, CaCl2.
- Small(subscripe) number indicates number of each atom in the compound.
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