Refer to the periodic table, and decide which of the following molecules is held together by nonpolar covalent bonds. 
Definitions:
Market Rate of Return
The expected or average annual rate of return on an investment, based on historical or specified market data.
Asset-specific Risk
The risk associated with an investment in a specific asset, which can result from factors unique to that asset, independent of the market.
Portfolio Diversification
Portfolio diversification is an investment strategy that aims to reduce risk by allocating investments among various financial instruments, industries, and other categories.
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