Ice is less dense than water. Hydrogen bonding makes water more dense than when it is in the form of ice!
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Because they have a full outer shell and they are both noble gases...Because the outer shell has attained stable electronics configuration of octate rule this it is with noble gas as helium.
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Potential energy is the energy stored. What do u think it is? (I don't really know)
Carbon has a higher boiling point.
If an object has a higher density than the fluid it is in (fluid can mean liquid or gas), it will sink. If it has a lower density, it will float. Density is determined by an object's mass and volume. If two objects take up the same volume, but have one has more mass, then it also has a higher density.