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BELLRINGER

BELLRINGER. EXPLAIN IN COMPLETE SENTENCES THE BASICS OF IONIC BOND STRUCTURE. ELEMENT OF THE DAY. Calcium Ca ATOMIC NUMBER 20 ATOMIC WEIGHT 40.08 Alkaline metal, reactive ATOMIC STRUCTURE: 20p, 20e, 20n ELECTRONIC STRUCTURE: 2, 8, 8, 2. Chemical Bonds III.

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BELLRINGER

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  1. BELLRINGER EXPLAIN IN COMPLETE SENTENCES THE BASICS OF IONIC BOND STRUCTURE

  2. ELEMENT OF THE DAY CalciumCaATOMIC NUMBER 20 ATOMIC WEIGHT 40.08 Alkaline metal, reactiveATOMIC STRUCTURE: 20p, 20e, 20n ELECTRONIC STRUCTURE: 2, 8, 8, 2

  3. Chemical Bonds III

  4. COVALENT BONDbond formed by the sharing of electrons

  5. Covalent Bond • Between nonmetallic elements of similar electronegativity. • Formed by sharing electron pairs • Stable non-ionizing particles, they are not conductors at any state • Examples; O2, CO2, C2H6, H2O, SiC

  6. Covalent Bonds

  7. Bonds in all the polyatomic ions and diatomics are all covalent bonds

  8. NONPOLAR COVALENT BONDS when electrons are shared equally H2 or Cl2

  9. 2. Covalent bonds- Two atoms share one or more pairs of outer-shell electrons. Oxygen Atom Oxygen Atom Oxygen Molecule (O2)

  10. POLAR COVALENT BONDS when electrons are shared but shared unequally H2O

  11. Polar Covalent Bonds: Unevenly matched, but willing to share.

  12. - water is a polarmolecule because oxygen is more electronegative than hydrogen, and therefore electrons are pulled closer to oxygen.

  13. METALLIC BONDbond found in metals; holds metal atoms together very strongly

  14. Metallic Bond • Formed between atoms of metallic elements • Electron cloud around atoms • Good conductors at all states, lustrous, very high melting points • Examples; Na, Fe, Al, Au, Co

  15. Metallic Bonds: Mellow dogs with plenty of bones to go around.

  16. Ionic Bond, A Sea of Electrons

  17. Metals Form Alloys Metals do not combine with metals. They form Alloys which is a solution of a metal in a metal. Examples are steel, brass, bronze and pewter.

  18. Formula Weights • Formula weight is the sum of the atomic masses. • Example- CO2 • Mass, C + O + O 12.011 + 15.994 + 15.994 43.999

  19. Practice • Compute the mass of the following compounds round to nearest tenth & state type of bond: • NaCl; • 23 + 35 = 58; Ionic Bond • C2H6; • 24 + 6 = 30; Covalent Bond • Na(CO3)2; • 23 + 2(12 + 3x16) = 123; Ionic & Covalent

  20. Activities • EACH GROUP WORKS ON THE elements GIVEN ON THE BOARD • YOU DRAW covalent bond STRUCTURE OF • YOUR ELEMENTS IN THE WAY I DID FOR • Cand OON THE BOARD • AFTER YOU FINISHED, YOUR GROUP LEADER PRESENTS THE RESULT • Group 1 - Cl, Cl, 2 - F, F, 3 - O2, 4 - K, I, 5 - I, I, 6 - Si, C, 7 - H2, 8 - H2, O2 , 9 - C2, H6, 10 - C, O2

  21. Conclusion • covalent bonds are formed between nonmetals and nonmetals. • Both ions are attracted share the same electrons. • Each atom has a tendency to fill outer shell as • the noble gas

  22. Exit quiz • Describe properties of covalent bond. • Predict properties of covalent bond using its electronic structure . • Evaluate # of electrons in outer orbital of each atom component in covalent bond using atomic numbers and electronic structure of components.

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