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  2. 73 (number) - Wikipedia

    en.wikipedia.org/wiki/73_(number)

    73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest natural number with twelve letters in its spelled out name. It is the 21st prime number and the fourth star number. [1] It is also the eighth twin prime, with 71.

  3. Atomic number - Wikipedia

    en.wikipedia.org/wiki/Atomic_number

    The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of its atomic nucleus. For ordinary nuclei composed of protons and neutrons , this is equal to the proton number ( n p ) or the number of protons found in the nucleus of every atom of that element.

  4. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    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 ...

  5. 49 (number) - Wikipedia

    en.wikipedia.org/wiki/49_(number)

    Along with the number that immediately derives from it, 77, the only number under 100 not having its home prime known (as of 2016). The smallest triple of three squares in arithmetic succession is (1,25,49), and the second smallest is (49,169,289). 49 is the smallest discriminant of a totally real cubic field. [2]

  6. Periodic trends - Wikipedia

    en.wikipedia.org/wiki/Periodic_trends

    In general, the atomic radius decreases as we move from left-to-right in a period, and it increases when we go down a group. This is because in periods, the valence electrons are in the same outermost shell. The atomic number increases within the same period while moving from left to right, which in turn increases the effective nuclear charge.

  7. PBS Local Stations, Kids, Drama and Documentary FAST ... - AOL

    www.aol.com/pbs-local-stations-kids-drama...

    The public broadcaster has sealed a deal with Amazon to stream its PBS Kids channel, as well as 150 local PBS stations, as part of the Prime Video FAST channel offerings. “FAST” stands for ...

  8. List of elements by atomic properties - Wikipedia

    en.wikipedia.org/wiki/List_of_elements_by_atomic...

    This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.

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