In the following list, only
is not an example of matter.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;