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  2. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for arithmetic operations ...

  3. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ... Cal­cium 20 Ca 40.078:

  4. Isotopes of calcium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_calcium

    Calcium (20 Ca) has 26 known isotopes, ranging from 35 Ca to 60 Ca. There are five stable isotopes (40 Ca, 42 Ca, 43 Ca, 44 Ca and 46 Ca), plus one isotope (48 Ca) with such a long half-life that it is for all practical purposes stable.

  5. Wikipedia : WikiProject Elements/Isotope tables/Element 31-40

    en.wikipedia.org/.../Isotope_tables/Element_31-40

    40 Zirconium: List: 74 Zr 75 Zr 76 Zr 77 Zr 78 Zr 79 Zr 80 Zr 81 Zr 82 Zr 83 Zr 84 Zr 85 Zr 86 Zr 87 Zr 88 Zr 89 Zr 90 Zr 91 Zr 92 Zr 93 Zr 94 Zr 95 Zr 96 Zr 97 Zr 98 Zr 99 Zr 100 Zr 101 Zr 102 Zr 103 Zr

  6. List of physical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_constants

    The constants listed here are known values of physical constants expressed in SI units; that is, physical quantities that are generally believed to be universal in nature and thus are independent of the unit system in which they are measured.

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