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Electronic arrangement and groups

Electronic arrangement and groups. Objectives. To learn about electron configuration and the chemical relevance of this. To be able to relate the electron configuration to the position and reactivity of an element. 1 st 20.

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Electronic arrangement and groups

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  1. Electronic arrangement and groups

  2. Objectives To learn about electron configuration and the chemical relevance of this. To be able to relate the electron configuration to the position and reactivity of an element.

  3. 1st 20 These are easy. After this they get tough, so we’ll get these understood first! No. 1 is H: 1 No. 2 = He: 2 No. 3 is Li: 2:1 No.4 is Be: 2:2 No.5 is B: 2:3 No.10 is Ne: 2:8 No. 11 is Na: 2:8:1 Write out all 20

  4. What do you notice Look at all the arrangements you have written. What do you notice about them when you look back at the periodic table

  5. Correct The group number is the same as the number of electrons in the outer shell/orbit/energy level. This is referred to as the valence shell.

  6. Atoms like full valence shells How can atoms get full valence energy levels? How can the following get full valence energy levels? Chlorine Aluminium Sodium Oxygen Beryllium Nitrogen Carbon

  7. Which are reactive? Chlorine Aluminium Sodium Oxygen Beryllium Nitrogen Carbon Now develop a rule which relates number of electrons in the valence shell to reactivity. What else affects reactivity? Why does it work differently for groups 1 and 7?

  8. Electron shells 1st 20 are easy. Just fill shells s (takes 2) and p takes (6) After this there are d shells (take 10) which fill between s and p In periods 6 and 7 the f shell fills after d1 and before d2 s and p shells are numbered according to period d shells are numbered period – 1 f shells are numbered period – 2 The order in which they fill is shown on the next slide

  9. More electron shells • 1s Hydrogen and Helium 4d Yttrium - Cadmium • 2s Lithium and Beryllium 5p Indium - Xenon • 2 p Boron – Neon 6sCaesium and Barium • 3s Sodium and Magnesium 4f Cerium - Lutetium • 3p Aluminium – Argon 5dLanthanum - Mercury • 4s Potassium and Calcium 6p Thallium - Radon • 3d Scandium – Zinc 7sFrancium and Radium • 4p Gallium – Krypton 5fThorium - Lawrencium • 5s Rubidium – Strontium 6d Actinium - Uub • 7pUut – Uuh (in fact 4f fills after Lanthanum but before Hafnium; 5f between Actinium and Rutherfordium)

  10. Complete this table

  11. Periodic Table

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