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(Important people who worked on the PT (Lothar Meyer, Mendeleev- Also…
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Alkali Metals: They are very reactive, electropositive, monovalent metals forming strongly Alkaline hydroxide.
Transition Metals: Chemically they show variable valence and a strong tendency to form coordination compounds, and many if their compounds are colored.
Representative Elements: Are those two elements within the first two families and the last six families or groups of the periodic table
Halogens: The halogens are a group in the periodic table consisting of five chemically related elements: Florine, Chlorine, Bromine, Iodine, Astatine, and Tennessine.
Cation: Positive charge- Anions: Negative charge- Ionization: The amount of energy required to remove the most loosely bound electron- Electronegativity: To attract a shared pair of electrons towards itself.
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Periodic Law- The law that the properties of the element are periodic functions of their atomic numbers.
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