4. A covalent bond between two atoms is A. Formed when each atom shares one of its inner-orbit electrons with the other atom B. Formed when each atom shares one of its outer-orbit electrons with the other atom C. The strongest of the chemical bonds D. Formed when each atom shares one of its inner-orbit electrons with the other atom and the strongest of the chemical bonds E. Formed when each atom shares one of its outer-orbit electrons with the other atom and the strongest of the chemical bonds | |
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