7Intermolecular Forces Physical PropertiesMedium1 mark
Elements X, Y and Z are all found in the first two periods of the Periodic Table.
Their Pauling electronegativity values are shown.
| element | electronegativity |
|---|---|
| X | 1.0 |
| Y | 2.1 |
| Z | 4.0 |
Substances exist with formulae XZ, YZ and Z.
Which row shows these substances in order of increasing melting point?
| lowest melting point | highest melting point | ||
|---|---|---|---|
| A | XZ | YZ | Z |
| B | XZ | Z | YZ |
| C | Z | YZ | XZ |
| D | Z | XZ | YZ |