Periodic properties of elements
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Periodic Classification of elements

Periodic Classification of elements

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Periodic properties of elements Presentation Transcript

  • 1. TOPIC : PERIODICITY IN PROPERTIES TEACHER: Mrs. V. GOWRI (PGT-Chemistry) BY VISHNU PRASAD VP XI A 1 KENDRIYA VIDYALAYA
  • 2.  Atomic Size And Radii  Ionization energy  Electron Gain Enthalpy  Electro negativity  Metallic character  Non Metallic Character
  • 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.  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. 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. 400 350 300 250 200 Group 1 (li to Cs) 150 Group 17 (F to I) 100 50 0
  • 7.  Covalent Radii  Metallic Radii  Vanderwaal’s Radii  Ionic Radii  Cation  Anion
  • 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.  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. Chart Title 150 Axis Title 100 50 0 -50 -100 Group 1 Group 0
  • 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.  Metallic Character  Increases along the group.  Decreases along the period.  Non character  Decreases along the group.  Increases along the period.