Examlex
Elements in the same period of the periodic table have similar valence shell electron configurations.
Petroleum
A natural, flammable liquid found in the Earth's formations, composed of a complex mixture of hydrocarbons and used primarily as fuel.
Opportunity Cost
The value of the best alternative forgone when a decision is made to pursue a particular course of action.
Machinery
Mechanical devices or equipment used in various industries to perform tasks more efficiently than manual labor.
Petroleum
A naturally occurring liquid found beneath the Earth's surface that can be refined into fuel and various chemical products.
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