Possible Clues:

• Rare element of sexual excite­ment with female — I'm keeping out, essentially
• Element which is immediately below iron in the periodic table
• Hard brittle white element of the platinum metal group
• Element name derived from the Latin for 'Russia'
• I'm unhurt somehow, pierced by tip of base metal
• Element of symbolically backing biblical city
• In those days international unit included unusual, singular1 across
• Element number 55-Across
• Uranium temperature splitting one element or another
• The province of the upper classes must take cover from peculiar element