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Botkin Environmental Science Earth as Living Planet 8th txtbk

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A-6 Appendix<br />

<br />

<br />

-<br />

4 <br />

O <br />

-<br />

<br />

Chemical Reactions<br />

<br />

<br />

<br />

chemical<br />

reaction <br />

<br />

-<br />

<br />

<br />

HOCO<br />

H CO<br />

2 2 2 3<br />

<br />

-<br />

<br />

<br />

<br />

<br />

<br />

<br />

-<br />

<br />

<br />

O <br />

-<br />

<br />

sunlight<br />

6CO 6H O C H O 6O<br />

2 2 6 12 6 2<br />

<br />

<br />

-<br />

-<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

Electron<br />

cloud<br />

Orbitals<br />

Electron<br />

shells<br />

Nucleus<br />

Nucleus contains<br />

6 protons and<br />

6 neutrons<br />

Proton (positive charge)<br />

Neutron (no charge)<br />

Electron (negative charge)<br />

(a) (b) (c)<br />

E.1 (a) Idealized diagram showing the b<strong>as</strong>ic structure of an atom <strong>as</strong> a nucleus surrounded by a cloud of electrons. (b) Conceptualized<br />

model of an atom of carbon with six protons and six neutrons in the nucleus and six orbiting electrons in two energy shells.<br />

(c) Three-dimensional view of (b). Size of nucleus relative to size of electron shells is greatly exaggerated.<br />

[Source: After F. Press, and R. Siever Understanding <strong>Earth</strong> (New York: Freeman, 1994).]

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