π The periodic table consists of rows called periods and columns called groups.
π‘ Elements in the periodic table are arranged by their atomic number, which determines the number of protons in their nucleus.
π¬ The group number of an element indicates the number of electrons in its outer shell.
π The periodic table provides information about the number of electrons in the outer shell of an atom and the element's electronic configuration.
π Elements in the same group have similar chemical properties due to the same number of outer shell electrons.
π Periodicity is the trend in properties across each period, with elements changing from metals to nonmetals from left to right.
π¬ The periodic table provides information about atomic radius, ionization energy, and electronegativity.
βοΈ As we go down a group on the periodic table, elements become more metallic and atomic radius increases.
βοΈ Metals lose electrons while nonmetals gain electrons in reactions.
π There are three groups of elements in the periodic table: alkali metals, halogens, and noble gases.
π Metals become more reactive as you move down Group 1 of the periodic table.
π Nonmetals become less reactive as you move down Group 17 of the periodic table.
π The elements in Group 18 have a full outer shell of electrons and are very unreactive.
π The densities and boiling points of Group 18 elements increase as you move down the group.
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