How many lone pairs of electrons are on the nitrogen atom? 
Definitions:
Portfolio Beta
A measure of the overall risk of a portfolio of investments, comparative to the market as a whole.
Risk-free Asset
An asset which is presumed to have a guaranteed return with no risk of financial loss.
Beta
A benchmark for the changeability, or structural risk, found in a security or an assemblage of investments measured against the overall market.
Portfolio Variance
A measure used in finance to quantify the volatility from the mean return of a portfolio, indicating the spread of its returns.
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