distance between the centre of an atom to the outermost shell

energy required to remove outer most e-

energy released when e- is added

ability of an atom to attract shared e- in a bond

likelihood of an atom to engage with another

effective nuclear charge

how effective the nucleus attracts e-

number of shells protecting the nucleus

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chem periodic trends

Term	Definition
atomic radius	distance between the centre of an atom to the outermost shell
ionization energy	energy required to remove outer most e-
electron affinity	energy released when e- is added
electronegativity	ability of an atom to attract shared e- in a bond
reactivity	likelihood of an atom to engage with another
effective nuclear charge	how effective the nucleus attracts e-
shielding effect	number of shells protecting the nucleus