Determine the number of lone pairs of electrons on the indicated atom. 
Definitions:
Average Tax Rate
The portion of total income that is paid as tax, calculated by dividing the total tax amount by the taxable income.
Tax Base
The total amount of assets or revenue that a government can tax to fund its operations and services.
Sectors
Distinct parts or areas within an economy, characterized by a specific kind of activity, such as the agricultural, manufacturing, or service sector.
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