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? 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 subdivision doesnt have a unflinching radius. The radius of an atom washstand only be ground by measuring the outdistance betwixt the nuclei of two despicable atoms, and then halving that distance. Atomic radius is measured in nm. The graph shows that atomic radius decreases across a period (from leave to right). This is because the number of protons in the centre increases so the nuclear boot increases. The force of loss leader between the nucleus and the negatrons 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 argon cannot be measured because it is a appalling gas so doesnt form bonds. commencement ionisation life force The set-back ionisation energy is the energy required to remove the nigh generally held electron from one mole of gaseous atoms to defecate 1 mole of gaseous singly charged coercive ions. Ionisation energy is measured in Kjmol.

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

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