a strong bond formed between atoms by sharing pairs of electrons (1 pair for a single bond and 2 pairs for a double bond). If the sharing is unfair, and 1 of the atoms (the more electronegative one) hogs the shared electrons, we call it a polar covalent bond. Covalent bonds are intramolecular bonds – the type of bond that hold atoms together to form molecules (for example, they hold together the 2 H’s & the O in water). But, since they’re not easily broken, these are not the kind of bonds that you want to have when molecules “bind” to one another. Instead, intermolecular (between molecule) bonds are non-covalent, involving charge- or partial-charge-based attractions but no electron sharing. Therefore non-covalent bonds are “easily breakable” but covalent bonds are not.
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