Covalent bonds

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Covalent bonds

  1. 1. Covalent Bonds
  2. 2. Covalent Bonds • Covalent bonds occur when atoms share electrons. • Covalent bonds generally form between nonmetals. • Atoms that are covalently bonded form molecules.
  3. 3. Covalent Bonds • Covalent bonds occur at unpaired valence electrons on the outer shell for each atom. • Example: H2O has 2 bonds: Before… H O H After… O H H
  4. 4. Covalent Bonds • Covalent bonds create neutral molecules when they come together. • How many bonds between 2 atoms? – Covalently bonded atoms can bond up to 3 times. They cannot exceed 3 bonds between two atoms.
  5. 5. Covalent Bonds • Double bonds: When two atoms share two pairs of electrons. – EX: O2 • Triple bonds: When two atoms share three pairs of electrons. – EX: N2
  6. 6. Covalent Bonds • Properties of Covalent Bonds: – – – – Low melting points Low boiling points Poor conductor of electricity Between nonmetals and nonmetals
  7. 7. Covalent Bonds • Properties of Covalent Bonds: – – – – Low melting points Low boiling points Poor conductor of electricity Between nonmetals and nonmetals

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