In class activity Write your name on the back in large letters: include last initial 1. Draw a dot diagram of sodium and 2. What is the charge of ion that chlorine atoms magnesium would tend to form? Positive 2 Why? It has two valence electrons, that it tends to lose to other atoms—leaving a positive charge imbalance 3. Dot diagram of sodium and 4. Is the change from sodium and chlorine chlorine ions to sodium chloride a physical or a chemical change? It is a chemical change: the new substance has different properties than its reactants
5.
Na
Cl
Na+
Cl -
What is the chemical formula of Calcium Fluoride?
CaF2
6.
List these covalent compounds in order of increasing polarity: PF, SF, GaF, GeF
2
1
4
3
