Answer:
Because electron mass is so insignificant compared to proton and neutron mass that it can be ignored.
Explanation:
In the <em>trial structure</em> (1st image below), every atom has an octet.
Valence electrons = 20
Valence electrons available = 4 + 2 +10 = 16
The trial structure has 4 electrons too many. The actual structure must have <em>two double bonds or one triple bond.</em>
The second image shows two possible Lewis structures.
Answer:
A, Vapor pressure is very high
E. Also the equilibrium constant should not have units.