Properties of the elements of period 3 (Na - Ar) to illustrate the periodic trends What is periodicity? Periodicity is the repeating pattern in which the elements are arranged in the periodic table, these are some of the trends shown from looking at the periodicity of the elements. Atomic radius An atom doesn't have a fixed radius. The radius of an atom can only be found by measuring the distance between the nuclei of two touching …showed first 75 words of 475 total…

…showed last 75 words of 475 total…the Periodic Table the amount of positive charge in the nucleus increases. And because electrons are negative, they are attracted to the positive nucleus increasly more across the period so this means that the the atom is more electronegative. Electrical conductivity 'The ability of a material to support the flow of an electrical current'. Electrical conductivity is measured in ohm cm. Values of Electrical Conductivity: Na10000 Mg16000 Al38000 Si4000 P1E - 13 S1.ooE -19