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(also called coordinate bond) one atom contributes both electrons (or a lone pair of electrons) to form a shared pair of electrons with another atom that has a vacant orbital in its valence shell during chemical bonding.
the natural circulation of water on, above or below the surface of the Earth.
a group of very reactive chemical elements that readily lose their one valence electron to form...
when radioactive particles collide with air molecules, they can cause the molecules to lose or...