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Chapter 2 - Periodic Trends

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Periodic Trends Atomic size (i) Down the Group Atomic size increase from top to down Reason : because the number of inner shells down the group increases Atomic size (ii) Across the period Atomic size decreases from left to right Reason : steady increase in the effective nuclear charge cause the valence electron to be held more strongly by nucleus Explanation Elements in same period have the same principal quantum number, n. However the nuclear charge increases as the number of protons in
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  Periodic Trends  Atomic size increase from top to down Reason  : because the number of inner shells down the group increases Atomic size (i) Down the Group  Atomic size (ii) Across the period Atomic size decreases from left to right   Reason : steady increase in the effective nuclear charge cause the valence electron to be held more strongly by nucleus  Explanation Elements in same period have the same principal quantum number, n. However the nuclear charge increases as the number of protons increases. Effective nuclear charge –  the strength of attraction between the outer most electrons and the nuclear charge . Element Electron configuration Period Na 1s 2 2s 2 2p 6 3s 1 3 Si 1s 2 2s 2 2p 6 3s 2 3p 2 3 Cl 1s 2 2s 2 sp 6 3s 2 3p 5 3

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