The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...
These describe how a subject looks and behaves. Substances have both physical and chemical properties. Developing the periodic table The periodic table was developed by grouping elements with ...
Word equations and balanced chemical equations represent the changes ... from the atom's atomic number and mass number. The periodic table - AQA Mendeleev made an early periodic table.
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