Certain Period 2 Elements Exhibit Behaviors Similar to Period 3

question 12

Multiple Choice

Certain Period 2 elements exhibit behaviors similar to Period 3 elements immediately below and to the right. One of these interesting diagonal relationships occurs between beryllium and aluminum. Which of the following is one of their differences?

• A)Some aluminum compounds and all beryllium compounds show significant covalent character in the gas phase.
• B)Beryllium forms bridge bonds in its hydrides while aluminum does not.
• C)Both form oxides that are impervious to reaction with water.
• D)The cations for both strongly polarize nearby electron clouds.
• E)Beryllium occurs in nature as the uncombined element, whereas aluminum does not.

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Definitions:

Aggregate Demand

The comprehensive call for goods and services within an economic setting, set at a particular total price level for a given temporal duration.

Aggregate Supply

Refers to the total quantity of goods and services that producers in an economy are willing and able to supply at a given overall price level in a given period.

Depression

A severe and prolonged downturn in economic activity, characterized by significant declines in income, employment, production, and retail sales.

Keynes

Keynes refers to John Maynard Keynes, a British economist whose theories on government spending and monetary policy revolutionized economic thinking and policy in the 20th century.