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Let's Get Together! Ya Ya Ya ...

Let's Get Together! Ya Ya Ya. Bonding SCH 3U. Chemical Bonding. Chemical bonds are attractions between the atoms within a molecule. When a chemical bond is formed the molecule is more stable than the isolated atoms.

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Let's Get Together! Ya Ya Ya ...

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  1. Let's Get Together! YaYaYa... Bonding SCH 3U

  2. Chemical Bonding • Chemical bonds are attractions between the atoms within a molecule. • When a chemical bond is formed the molecule is more stable than the isolated atoms. • That means that the molecule is of lower energy than the individual atoms.

  3. The increase in stability is caused by the electrons being simultaneously attracted to the two nuclei. The original attraction/repulsion forces of each individual atom do not contribute to the increase in stability.

  4. The electrons in the outer energy level of an atom are the ones which usually participate in chemical bonding. • The number of valence electrons of each atom determines the number of bonds which can be formed. •  A stable octet can be achieved through the loss or gain of electrons or by the sharing of electrons.

  5. Octet Rule - atoms bond in order to achieve an electron configuration that is the same as the electron configuration of a noble gas. • Isoelectronic – When two atoms or ions have the same electron configuration.

  6. Lewis Dot Diagrams • Lewis suggested a means of keeping track of outer (or valence) electrons. To Draw a proper Lewis Dot Symbol • Write the chemical symbol • Determine the number of valence electrons • Place the electrons one at a time in each corner of the symbol and once each corner is full, go back and begin to pair up the electrons until the valence is reached.

  7. IONIC BONDING A Real "Moving" Experience!

  8. Recall...

  9. Fill in the blanks.

  10. Ionic Bonding

  11. SODIUM AND CHLORINE

  12. MAGNESIUM AND IODINE

  13. Now it’s your turn! • Illustrate the bonding between the following pairs of elements. Be sure to include the Lewis dot diagram as well as the formula unit and chemical formula. (a) Mg and O  (b) Ca and Cl  (c) Na and O (d) Al and Cl  (e) Li and Br  (f) Al and S (g) Mg and N  (h) K and I  (i) Na and P

  14. Metallic Bonds • This bond is considered as a 'sea' of valence electrons. • The metal atoms are considered to be packed tightly allowing for valence electrons of one atom to migrate to the valence shell of another metal atom. • This ability for electrons to move freely provides an explanation as to why metals make good electrical conductors.

  15. Metallic Bonds

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