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Ionic and Covalent Bonding Section 4.2. What holds bonded atoms together? Atoms WANT their valence shells filled They bond with other atoms in such a.

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Presentation on theme: "Ionic and Covalent Bonding Section 4.2. What holds bonded atoms together? Atoms WANT their valence shells filled They bond with other atoms in such a."— Presentation transcript:

1 Ionic and Covalent Bonding Section 4.2

2 What holds bonded atoms together? Atoms WANT their valence shells filled They bond with other atoms in such a way that these valence shells get filled up

3 More about bonds Bonds can stretch and bend without breaking There are 3 main types of bonds –I–Ionic Bonds –M–Metallic Bonds –C–Covalent Bonds

4 Ionic Bonds Formed between oppositely charged ions –U–Usually alkali metals & halogens –S–Sometimes alkaline earth metals and halogens –M–More rare combinations exist Form as networks, not individual molecules When melted or dissolved in water, they conduct electricity Formed by the transfer of electrons

5 Fluorine Electron Transfer – Ionic Bonds + - FLUORIDE

6 Ionic compounds form networks, not molecules

7 Metallic Bonds Form by the attraction between the nucleus of one atom and the electrons of its neighbors. + -

8 Electrons move freely between metal atoms in metallic bonds

9 Covalent Bond Facts Made of molecules, not network structures Often formed between nonmetal atoms Can be solids, liquids, or gases Most compounds of this type have low melting points Do not conduct electricity Atoms joined by covalent bonds SHARE electrons

10 Shared Electrons in Covalent Bonds

11 Atoms may share more than one pair of electrons

12 Polyatomic Ions Some compounds have BOTH ionic and covalent bonds. Example: Hydroxide (OH - ) – Hydrogen and oxygen covalently bonded – Molecule is negatively charged, which behaves like an ion that can form an ionic bond

13 More Polyatomic Ions Carbonate Ammonium Cyanide


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