There is an anomaly in the boiling points and melting points for the hydrogen compounds of group 6A elements due to the intermolecular forces (bonds) existing between them.
What is hydrogen?
Hydrogen is a chemical element that is found in group one (1) on the periodic table. Thus, it has one (1) electron in its outermost shell.
Also, the symbol for hydrogen is "H" and it is a colorless, odorless, tasteless, and highly flammable gas.
The boiling points and melting points trends.
Generally, the boiling points and melting points of chemical compounds increase down the group on a periodic table due to an increase in their valence electrons and atomic radius (size). However, there is an anomaly in the boiling points and melting points for the hydrogen compounds of group 6A elements due to the intermolecular forces (bonds) existing between them.
Aside from water, the other gases in group 6A elements are hydrides and they do not form hydrogen bonds, thereby, causing an increase in their boiling points and melting points.
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