Hydrogen bonding is ultimately due to differences in between two atoms

Electronegativity leads to hydrogen bonding. When an atom has a large electronegative value, it is more easily able to attract hydrogen atoms, while the opposite also holds true. When an atom (or molecule) has a large distance that its valence electrons are from the nucleus, then the electronegativity value will be higher.

"The environmental change that occurs faster is definitely volcanic eruption. It may happen in an instant and destroy everything in its way, whereas the process of regrowth of forest after volcanic eruption is a slow one."

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