Читать книгу Geology For Dummies - Alecia M. Spooner - Страница 82

When two atoms bond together, and neither one donates or gives up an electron, they form a covalent bond. In a covalent bond the atoms share the electrons in their outer orbital shells. The sharing of electrons in covalent bonding creates a very strong bond because each atom participating in the electron share has a full outer shell and a neutral charge.

An example of a covalent bond is found in a molecule of water, H₂O. As illustrated in Figure 5-5, the two atoms of hydrogen (H) share electrons with the atom of oxygen (O).

FIGURE 5-4: The ionic bond between sodium and chloride to form a molecule of NaCl.