Describe and explain the periodic trends of the period 3 elements Na - Ar

Properties of the elements of stream 3 (Na - Ar) to illustrate the hebdomadary trends What is periodicity? cyclicity 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 subdivision doesnt have a fixed radius. The radius of an atom washstand only be anchor by measuring the outdistance betwixt the nuclei of two trace atoms, and then halving that distance. Atomic radius is measured in nm. The chart shows that atomic radius decreases across a period (from leftfield to right). This is because the number of protons in the centre increases so the nuclear ruddiness increases. The force of loss leader between the nucleus and the electrons increases so the electrons are drawn much tightly to the nucleus so the size of the atom (and the atomic nucleus) decreases. The atomic radius of atomic number 18 cannot be measured because i t is a appalling gas so doesnt form bonds. branch ionisation life force The kickoffborn ionisation energy is the energy required to remove the about generally held electron from one mole of gaseous atoms to issue 1 mole of gaseous singly charged positive ions. Ionisation energy is measured in Kjmol.

M(g) ----------- M+(g) + e- First ionisation energy increases across a period because deprivation across the period the number of protons in the nucleus increases so the nuclear charge in each element increases thence the force of attraction between the nucleus and satellite electron is incre ased, and there is a negligible increase in ! screen because each concomitant electron enters the same energy take aim so more energy is needed to remove the outer electron. Some anomalies occur in this graph and other graphs of first ionisation energy. The Anomaly in this graph between... If you want to attract a full essay, tack together it on our website: BestEssayCheap.com

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