Lecture02-Ch02+Life+Chemistry+and+Energy

Cationspositivelychargedions

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Unformatted text preview: so they have eight electrons in their outermost shells. 5 CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES • Chemical bond is an attractive force that links atoms together to form molecules. • There are several kinds of chemical bonds. TABLE 2.1 CHEMICAL BONDS AND INTERACTIONS “Ionic bond” 6 IONIC BONDS • Ions are charged particle that form when an atom gains or loses one or more electrons. Cations—positively charged ions Anions—negatively charged ions • Ionic bonds result from the electrical attraction between ions with opposite charges. • The resulting molecules are called salts. FIGURE 2.2 IONIC BOND BETWEEN SODIUM AND CHLORINE 2, 8, 1 2, 8, 7 7 CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES • Ionic attractions are weak, so salts dissolve easily in water. COVALENT BONDS • Covalent bonds form when two atoms share pairs of electrons. • The atoms attain stability by having full outer shells. • Each atom contributes one member of the electron pair. 8 CONCEPT 2.2 ATOMS INTERACT AND FORM...
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