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A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the ...
HTML element content categories. HTML documents imply a structure of nested HTML elements. These are indicated in the document by HTML tags, enclosed in angle brackets thus: < p >. [72] [better source needed] In the simple, general case, the extent of an element is indicated by a pair of tags: a "start tag" < p > and "end tag" </ p >. The text ...
A description list (a.k.a. association list or definition list) consists of name–value groups, [21] and was known as a definition list prior to HTML5. [22] Description lists are intended for groups of "terms and definitions, metadata topics and values, questions and answers, or any other groups of name–value data".
Element Pair 1 Pair 2 Note 1 H: Hydrogen Removed as common 2 He: Helium / ˈ h iː l i ə m / HEE-lee-əm: 3 Li: Lithium / ˈ l ɪ θ i ə m / LITH-ee-əm: 4 Be: Beryllium / b ə ˈ r ɪ l i ə m / bə-RIL-ee-əm: 5 B: Boron / ˈ b ɔːr ɒ n / BOR-on: 6 C: Carbon Removed as common 7 N: Nitrogen Removed as common 8 O: Oxygen Removed as common 9 ...
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41 of the 118 known elements have names associated with, or specifically named for, places around the world or among astronomical objects. 32 of these have names tied to the places on Earth, and the other nine are named after to Solar System objects: helium for the Sun; tellurium for the Earth; selenium for the Moon; mercury (indirectly), uranium, neptunium and plutonium after their respective ...