Calcium and oxygen react to produce the ionic compound calcium oxide.
The diagrams show the arrangement of electrons in a calcium atom and in an oxygen atom:
Draw similar diagrams to show the arrangement of the electrons in the ions formed when calcium reacts with oxygen. Show all the electrons in each ion and include the charge on each ion.
Carbon tetrafluoride is a simple molecular compound. The displayed formula for a molecule of carbon tetrafluoride is:
Draw a dot and cross diagram to show the arrangement of the electrons in this molecule. Show only the outer electrons.
The table shows some properties of calcium oxide and carbon tetrafluoride.
| Compound | Melting point | Ability to conduct electricity when molten or liquid |
|---|---|---|
| calcium oxide | very high (2572 ∘C2572\ ^\circ\text{C}2572 ∘C) | good |
| carbon tetrafluoride | very low (−183 ∘C-183\ ^\circ\text{C}−183 ∘C) | poor |
Explain these properties of each compound.
