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Forming Compounds

Forming Compounds. Compounds. pure substances containing two or more elements in fixed proportions when atoms collide , valence electrons interact to make valence shells stable (like that of nearest noble gas). Two Types of Compounds. Atom may gain electrons Atom may give up electrons.

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Forming Compounds

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  1. Forming Compounds

  2. Compounds • pure substances containing two or more elements in fixed proportions • when atoms collide, valence electrons interact to make valence shells stable (like that of nearest noble gas)

  3. Two Types of Compounds • Atom may gain electrons • Atom may give up electrons IONIC COMPOUND

  4. Atoms may share electrons molecular compound

  5. Ionic Compounds • usually formed by metal with non-metal • metals lose electrons forming cations • non-metals gain electrons forming anions • combine in a ratio to make a neutral compound • overall charge of the compound must be zero • Ionic bond: force of attraction between oppositely charged ions

  6. Properties of Ionic Bonds • Bonds are very strong • Soluble in water • High melting/boiling points • Conduct electricity when dissolved in water • Hard and brittle • Lattice structure

  7. Naming Ionic Compounds • Let’s use POTASSIUM and BROMINE • These form the ionic compound KBr

  8. Step 1: Name the metal ion first • Potassium • Step 2: Name the non-metal ion second • Bromide • Step 3: Name the ionic compound by combining ion names • Potassium bromide

  9. Together … • Formulas of ionic compounds often contain numbers • These numbers are called subscripts – let’s ignore for now • Try … ZnF2

  10. Practice • CaS • MgCl2 • Na3P • LiBr • CaI2 • Al2O3 • Mg3N2

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