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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.

  3. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity. For more detailed information about the origins of element names, see List of chemical element name etymologies.

  4. Molar concentration - Wikipedia

    en.wikipedia.org/wiki/Molar_concentration

    In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol/dm 3 in SI units. A solution with a concentration of 1 mol/L is said to be 1 molar , commonly designated as 1 M or 1 M . [ 1 ]

  5. 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.

  6. Chemical symbol - Wikipedia

    en.wikipedia.org/wiki/Chemical_symbol

    The periodic table, elements being denoted by their symbols. Chemical symbols are the abbreviations used in chemistry, mainly for chemical elements; but also for functional groups, chemical compounds, and other entities.

  7. Mole (unit) - Wikipedia

    en.wikipedia.org/wiki/Mole_(unit)

    Greenhouse and growth chamber lighting for plants is sometimes expressed in micromoles per square metre per second, where 1 mol photons ≈ 6.02 × 10 23 photons. [7] The obsolete unit einstein is variously defined as the energy in one mole of photons and also as simply one mole of photons.

  8. Orders of magnitude (molar concentration) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(molar...

    List of orders of magnitude for molar concentration; Factor (Molarity) SI prefix Value Item 10 −24: yM 1.66 yM: 1 elementary entity per litre [1]: 8.5 yM: airborne bacteria in the upper troposphere (5100/m 3) [2]

  9. Chemical element - Wikipedia

    en.wikipedia.org/wiki/Chemical_element

    The following sortable table shows the 118 known elements. Atomic number, Element, and Symbol all serve independently as unique identifiers. Element names are those accepted by IUPAC. Block indicates the periodic table block for each element: red = s-block, yellow = p-block, blue = d-block, green = f-block.

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