What type of number is this. Water boils at sea level at 100.0 Celsius.

100

Explanation:

answer is to simple why it is 100.0 when you write the number down on your calculator it give you 100 because the last zero does not count

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.