Periodic properties of elements

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Periodic Classification of elements

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Periodic properties of elements

  1. 1. TOPIC : PERIODICITY IN PROPERTIES TEACHER: Mrs. V. GOWRI (PGT-Chemistry) BY VISHNU PRASAD VP XI A 1 KENDRIYA VIDYALAYA
  2. 2.  Atomic Size And Radii  Ionization energy  Electron Gain Enthalpy  Electro negativity  Metallic character  Non Metallic Character
  3. 3. Periodic Properties Group Period Exception Atomic Size / Radii Al to Ga Halogen to Noble Gases Ionization Energy Nitrogen-Oxygen pair Electron Gain Enthalpy Chlorine –Fluorine pair Electro negativity -------- Metallic character -------- Non metallic Character --------
  4. 4.  In group, size increases from top to bottom due to formation of new shells  In period ,size decreases from left to right due to effective nuclear charge  Exceptional:  In period, Halogens are slightly smaller than noble gases. (since noble gas have completed octet)  Atomic size doesn't increase much when we move from Al to Ga due to poor shielding of inner core electrons.
  5. 5. Atomic Radius vs Atomic Number 160 140 120 100 80 Atomic Radius vs Atomic Number 60 40 20 0 3 4 5 6 7 8 9
  6. 6. 400 350 300 250 200 Group 1 (li to Cs) 150 Group 17 (F to I) 100 50 0
  7. 7.  Covalent Radii  Metallic Radii  Vanderwaal’s Radii  Ionic Radii  Cation  Anion
  8. 8.  Energy required to remove an electron from an isolated gaseous atom  Na Na + + e Exceptional:  Nitrogen – Oxygen : Though I.E., increases along the period, nitrogen has more I.E., than Oxygen .Because nitrogen is already half filled & more stable.
  9. 9.  The energy released when an electron is injected into an isolated gaseous atom  Cl + eCl- + Energy  Exceptional:  F has more EGE than Cl ( in spite of decrease along the group),due to  Fluorine is small in size  Lone pair – Lone pair attraction is more.
  10. 10. Chart Title 150 Axis Title 100 50 0 -50 -100 Group 1 Group 0
  11. 11.  The power of an atom to pull the mutually shared pair of electron towards itself. negative elements  Most electronegative element is Fluorine(4)  Scales:  Millikan  Pauling  Example: HF : H---F  H~ + --- F~ - -partial charge
  12. 12.  Metallic Character  Increases along the group.  Decreases along the period.  Non character  Decreases along the group.  Increases along the period.

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