Ionic and Covalent Compounds

How many valence electrons do atoms need in the highest energy level to be stable? 8

How do atoms achieve stability? By gaining or losing electrons

Why are valence electrons important? Valence electrons are the electrons involved in bonding

Covalent Compounds Bond between non- metals Neutral atoms share electrons When a compound is formed by sharing electrons, it is called a molecule What is the result of this bond?

Which of the following are molecules? H2OH2O CO 2 NaCl Mg 3 P 2 N2O5N2O5

Ionic Compounds Bonds between metals + non-metals One atom gains an electron, one atom loses an electron Electrons are transferred

Which are Ionic Compounds?

Charges on an atom Why does the red atom lose an electron? Why does the blue atom gain an electron? What happens to the charge of the red atom? What happens to the charge of the blue atom? To achieve 8 electrons on outer orbital It loses an electron (-), so it becomes positive It gains an electron (-), so it becomes negative

Ionic Vs. Covalent Compounds Complete a Venn Diagram using the following terms: 1.Transferred electrons 2.Shared electrons 3.Bond to achieve full outer orbital 4.Metal + Non-metal 5.Only non-metals ionic covalent

Properties of Ionic and Covalent Compounds Ionic Compounds High melting points High boiling points Conduct electricity when dissolved in water Covalent Compounds Low melting points Low boiling points Do not conduct electricity