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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on. Each of these names can be further abbreviated by a one- or two-letter chemical symbol; those for hydrogen, helium, and lithium are respectively H, He, and Li. Neutrons do not affect the atom's chemical identity, but do affect its weight.

  3. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. 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]

  4. Movable type - Wikipedia

    en.wikipedia.org/wiki/Movable_type

    v. t. e. Movable type (US English; moveable type in British English) is the system and technology of printing and typography that uses movable components to reproduce the elements of a document (usually individual alphanumeric characters or punctuation marks) usually on the medium of paper .

  5. United States license plate designs and serial formats

    en.wikipedia.org/wiki/United_States_license...

    Formats for license plate numbers are consistent within the state. For example, Delaware is able to use six-digit all-numeric serials because of its low population. Several states, particularly those with higher populations, use seven-character formats of three letters and four digits, including 1ABC234 in California, 1234ABC in Kansas and ABC-1234 (with or without a space or dash) in Georgia ...

  6. Letterpress printing - Wikipedia

    en.wikipedia.org/wiki/Letterpress_printing

    Letterpress printing is a technique of relief printing for producing many copies by repeated direct impression of an inked, raised surface against individual sheets of paper or a continuous roll of paper. [1] A worker composes and locks movable type into the "bed" or "chase" of a press, inks it, and presses paper against it to transfer the ink ...

  7. United States one-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_one-dollar_bill

    A small number of these $1 bills entered circulation and the rest were kept in Treasury vaults until 1949 when they were issued in Puerto Rico. In 1934, the design of the $1 silver certificate was changed. This occurred with that year's passage of the Silver Purchase Act, which led to a large increase in dollar bills backed by that metal.

  8. Em (typography) - Wikipedia

    en.wikipedia.org/wiki/Em_(typography)

    In metal type, the physical size of a letter could not normally exceed the em. A digital font's design space in digital type is called the em, which is a grid with arbitrary resolution. Scaling the em to a particular point size is how imaging systems—whether for screen or print—work.

  9. Block (periodic table) - Wikipedia

    en.wikipedia.org/wiki/Block_(periodic_table)

    P. J. Stewart In Foundations of Chemistry, 2017 There is an approximate correspondence between this nomenclature of blocks, based on electronic configuration, and sets of elements based on chemical properties. The s-block and p-block together are usually considered main-group elements, the d-block corresponds to the transition metals, and the f-block corresponds to the inner transition metals ...

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