It can be either they can have a negative or positive charge more specifically negatively charged molecule would called an anion and a positive one would be cation.
Hydrogen bonds are typically stronger than Van der Waals forces bc they are based on permanent dipoles, that form when hydrogen comes in vicinity of a highly electronegative atom (like F, N, or O). These bonds are long-lasting and pretty strong.
Gain .....
It loses electron when a positive charge is formed..ex Na+
The group number tells us about the size weight and molecule elements involved. Also tells us about what types it can form and combine with as well as its reactions also
