PPT Slide
- Matter is composed of atoms. The atom is the smallest body that retains the unique identity of the element.
- Atoms of one element can be converted into atoms of another element only in a nuclear process.
- All atoms of an element have the same number of protons and electrons, which determines the elementís chemical behavior.
- Isotopes of an element differ in the number of neutrons, and thus in mass number, but a sample of the element is treated as though its atoms have an average mass.
- Compounds are formed by the chemical combination of two or more elements in specific ratios.
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