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In graph theory, the degree of a vertex is its number of connections. In a chemical graph, the maximum degree of an atom is its valence, and the maximum number of bonds a chemical element can make. For example, carbon's valence is 4. In a chemical graph, an atom is saturated if it reaches its valence.
In 1954, Gilbert wrote in his autobiography, The Man Who Lives in Paradise, that the Atomic Energy Laboratory was "the most spectacular of [their] new educational toys". Gilbert wrote that the Government encouraged the set's development because it believed the lab would aid public understanding of atomic energy and emphasize its constructive ...
A molecular model is a physical model of an atomistic system that represents molecules and their processes. They play an important role in understanding chemistry and generating and testing hypotheses.
Their earliest toys, under the "Chemcraft" trademark, were "chemical magic" sets, selling for less than one dollar (or about $25 in 2017 [8]). By the 1920s, they sold six different sets, the largest of which sold for $25 (or about $320 in 2017 [9]). Their range of toys broadened throughout the 1930s. [5]
Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics. This article contains the list of certain mnemonics in chemistry.
(Reuters) -California's public health department reported a possible case of bird flu in a child with mild respiratory symptoms on Tuesday, but said there was no evidence of human-to-human ...