minimum - First ionisation energy is the _________ energy required to remove one electron from the outermost orbital of a neutral gaseous atom in its ground state., decrease - The shielding effect of the electrons of the inner shells causes the outer electrons to be less attracted to the nucleus and thus _________ the magnitude of ionisation energy., Increases - Across a period, ionisation energy ___________ ., same - Isoelectronic species is a group of atoms or ions having the _________ electronic configuration., larger - Negative ions (anions) always __________ than their neutral atoms., quantum - Period number = Principle __________ number, n, of the electrons in valence shell., constant - The effective nuclear charge, Zeff for elements in the same group is __________ . , proton - Elements in periodic table are arranged by increasing ____________ number., electronegativity - Is a chemical property that describes the tendency of an atom to attract electrons (or electron density) of covalent bond towards itself., ratio - The electronic configuration of the valence electron for an element can be determined by using the following methods: By determining the ionisation energy ________ , and by  determining the differences in ionisation energy.,

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