What percentage of the sun is composed of gold?

Dear pericles,

Since our knowledge of the Sun's chemical composition is, so far,
based upon the interpretation of spectral analysis, the results are
only estimates. Nevertheless, the general picture of what elements
make the sun in what percentages is relatively reliable.

Two elements alone make up almost 99% of the Sun's mass: Hydrogen (ca.
74%) and Helium (ca. 25%). The small rest is composed from shares of
numerous elements, such as Iron, Titanium, Oxygen, and also Gold.

The percentage of Gold ist, compared to the Sun's total mass, tiny: 5
x 10 -10 percent. (with the "-10" being the potence factor of 10).

Sources:

Thinkquest Library: Elements of the Sun, by Elizabeth Beckett, Holly
Bernitt, and Vishwa Chandra
http://library.thinkquest.org/15215/Science/elements.html?tqskip1=1&tqtime=0702

WNCC College: Our Star - The Sun
http://www.wncc.net/courses/aveh/lecture/lecsun.htm

Search terms used:
sun chemical elements percent titanium hydrogen oxygen gold
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sonne wasserstoff kohlenstoff helium eisen titan gold
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"bestandteile der sonne" gold
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" composition of the sun" hydrogen helium gold titanium
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"the sun" abundance gold helium iron
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Hope this answers your question!
Best regards,
Scriptor

An exceptionally thorough and complete answer. Thanks!