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Group Columns in Periodic Table Number of electrons in the outer shell Group determines what? Periods Rows in Periodic Table Number of occupied electron shells Periods determine what? Energy required to remove one mole of electrons from one mole of gaseous atoms First Ionization energy The ability of an atom to attract electrons Electronegativity Number of electrons in the outer shell Chemical properties are determined by what? A more reactive halogen displaces the ions of the less negative halogen Halogens replace when... Show both acidic and basic properties Amphoteric oxides Soluble in water Alkalis are bases which are... In aqueous solution When do Alkalis form hydroxide ions? Ionic and basic Oxides of metals are... Covalent and acidic Oxides of non-metals are... Amphoteric Oxides of some elements in the middle of the periodic table are...