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Example :
Relative metal such as gold and platinum, non-metal such as diamond, graphite and sulfer.
All of the elements have been named. Some of these names are familiar to us, such as carbon
and magnesium and some are less familiar, such as dysprosium and roentgenium. We can
also name elements using their atomic numbers. For example, element 1 is hydrogen, element
2 is helium, element 3 is lithium, element 8 is oxygen, etc.
Figure 2.6: Periodic table of elements
Compounds
A compound is a substance that results from a combination of two or more different chemical
elements, in such a way that the atoms of the different elements are held together by chemical
bonds that are difficult to break. These bonds form as a result of the sharing or exchange of
electrons among the atoms. The smallest unbreakable unit of a compound is called a molecule.
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