In coordination chemistry, the coordination sphere refers to a central atom or ion and an array of molecules or anions, the ligands, around. Molecules that are attached noncovalently to the ligands are called the second coordination sphere.
Read more about Coordination Sphere: First Coordination Sphere, Second Coordination Sphere
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“If today there is a proper American “sphere of influence” it is this fragile sphere called earth upon which all men live and share a common fate—a sphere where our influence must be for peace and justice.”
—Hubert H. Humphrey (1911–1978)