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The options are the possible answers that the examinee can choose from, with the correct answer called the key and the incorrect answers called distractors. [4] Only one answer may be keyed as correct. This contrasts with multiple response items in which more than one answer may be keyed as correct.
This can hold up to two electrons. The second shell similarly contains a 2s orbital, and it also contains three dumbbell-shaped 2p orbitals, and can thus fill up to eight electrons (2×1 + 2×3 = 8). The third shell contains one 3s orbital, three 3p orbitals, and five 3d orbitals, and thus has a capacity of 2×1 + 2×3 + 2×5 = 18.
History (derived from Ancient Greek ἱστορία (historía) 'inquiry; knowledge acquired by investigation') [1] is the systematic study and documentation of the human past. [2] [3] History is an academic discipline which uses a narrative to describe, examine, question, and analyse past events, and investigate their patterns of cause and effect.
The history of the United States from 1917 to 1945 was marked by World War I, the interwar period, the Great Depression, and World War II. The United States tried and failed to broker a peace settlement for World War I , then entered the war after Germany launched a submarine campaign against U.S. merchant ships that were supplying Germany's ...
Broadly, the importance of the study of history lies in the ability of history to explain the present. John Bellamy Foster asserts that historical materialism is important in explaining history from a scientific perspective, by following the scientific method , as opposed to belief-system theories like creationism and intelligent design , which ...
Ancient history covers all continents inhabited by humans in the period 3000 BC – AD 500, ending with the expansion of Islam in late antiquity. [1] The three-age system periodises ancient history into the Stone Age, the Bronze Age, and the Iron Age, with recorded history generally considered to begin with the Bronze Age. The start and end of ...
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Thomas Jefferson, a key Founding Father, was the primary author of the Declaration of Independence, which Pulitzer Prize-winning historian Joseph Ellis says contains "the most potent and consequential words in American history". [6] Historian Richard Morris' selection of seven key founders was widely accepted through the 20th century.