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atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

British Columbia

(Encyclopedia)CE5 British Columbia, province, 366,255 sq mi (948,600 sq km), including 6,976 sq mi (18,068 sq km) of water surface, W Canada. The Conservatives ...

chemistry

(Encyclopedia)chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

electricity

(Encyclopedia)CE5 Electrical and radio symbols electricity, class of phenomena arising from the existence of charge. The basic unit of charge is that on the proton or electron—the proton's charge is designate...

Byzantine Empire

(Encyclopedia)CE5 CE5 Byzantine Empire (c.1000) Byzantine Empire, successor state to the Roman Empire (see under Rome), also called Eastern Empire and East Roman Empire. It was named after Byzantium, which Emp...

Trump, Donald John

(Encyclopedia)Trump, Donald John, 1946–, 45th President of the United States (2017–21), b. New York City. Prior to his election as president in 2016, Trump was a ...

Athens, city, Greece

(Encyclopedia)Athens ăthˈĭnz [key], Gr. Athínai, city (2021 urban agglomeration pop. 3,153,000), capital of Greece, E central Greece, on the plain of Attica, between the Kifisós an...

Utah , state, United States

(Encyclopedia)CE5 Utah yo͞oˈtäˌ [key], Rocky Mt. state of the W United States. It is bordered by Idaho and Wyoming (N), Colorado (E), Arizona (S), and Nevada (W), and touches New Mexico in the SE, at the Fou...

Zambia

(Encyclopedia)CE5 Zambia zămˈbēə [key], officially Republic of Zambia, republic (2015 est. pop. 15,066,000), 290,584 sq mi (752,614 sq km), central Africa. It borders on Congo (Kinshasa) in the north, on Tan...

Ireland

(Encyclopedia)Ireland, Irish Eire ârˈə [key] [to it are related the poetic Erin and perhaps the Latin Hibernia], island, 32,598 sq mi (84,429 sq km), second largest of the British Isles. The island is divided in...