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Bonding

Bonding. A chemical bond is a force that holds atoms together.

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Bonding

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  1. Bonding

  2. A chemical bond is a force that holds atoms together.

  3. Two Types of Bonds 1. Ionic Bond – the attraction between two oppositely charged ions. An ionic bond is formed when atoms gain or lose electrons. Ionic bonds form compounds.

  4. Ion – an atom or group of atoms that has become electrically charged. It is a charged particle.When an atom loses an electron, it loses a negative charge and becomes a positive ion.When an atom gains an electron, it gains a negative charge and becomes a negative ion.

  5. Ionic bond

  6. Atoms that gain electrons have a negative valence. (charge)Atoms that lose electrons have a positive valence. (charge)

  7. 2. Covalent Bonding – A type of bonding in which electrons are shared.When covalent bonding occurs, molecules are formed.

  8. Covalent Bond

  9. Compound – two or more elements chemically combinedby gaining, losing, or sharingelectrons.Molecule – a particle made of 2 or more atoms covalently bonded together.

  10. Chemical formulas – a shorthand way to represent a compound. ( H2O)In a chemical formula, the element with the positive charge is always written first.

  11. Valence number – The number of electrons an atom needs to gain, lose, or share to become stable. (Gain electrons – negative valence)(Lose electrons – positive valence.)

  12. Subscript – the number that shows how many atoms of an element are in the compound.

  13. How to Write Formulas • 1. Write the symbol correctly for both elements. • 2. Write the valence number above each symbol. Make sure you have a positive first, and then a negative. • 3. Criss-cross valences to make a subscript. • 4. NEVER write 1 as a subscript. (It is understood to be 1 if there is no number.) • 5. Reduce to lowest terms.

  14. Examples • Sodium Chloride Aluminum Oxide • Copper (I) Sulfide Iron (III) Iodide

  15. Calcium Sulfide 2. Copper (I)Iodide 3. Potassium Chloride 4. Iron(III) Bromide 5. Sodium Nitride 6. Antimony (V) Oxide

  16. Practice Problems • Aluminum Bromide • Calcium Iodide • Copper (I)Chloride • Hydrogen Oxide • Magnesium Nitride • Potassium Sulfide • Barium Fluoride • Lead Bromide

  17. Binary Compound – a compound composed of 2 elements. Polyatomic Ion- a group of positively or negatively charged covalently bonded atoms.

  18. Calcium Phosphate Tin (IV) Chromate Ammonium Oxide Magnesium Sulfate

  19. Naming compounds – change the ending of the second element to – “ide”.(Do not change the names of polyatomic ions.)Check to see if Roman numeral is needed.Ex: NaCl - Sodium ChlorideFe2O3 – Iron (III) Oxide

  20. Examples • Zn3N2 ______________________ • K2SO3 ______________________ • CuO ______________________ • Ba(C2H3O2)2 _____________________

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