SP-345 Evolution of the Solar
FIGURE 21.5.1.- The gravitational
energy and ionization potential of the most abundant elements.
Roman numerals refer to row in the periodic table, with "III"
including the fourth row. All elements in a band have approximately
the same gravitational energy and vion, as discussed
in secs. 21.4 and 21.5. Minor and trace elements are indicated,
respectively, by parentheses and brackets.
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