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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    It is an icon of chemistry and is widely used in physics and other sciences. It is a depiction of the periodic law, which states that when the elements are arranged in order of their atomic numbers an approximate recurrence of their properties is evident. The table is divided into four roughly rectangular areas called blocks. Elements in the ...

  3. Ordered list - Wikipedia

    en.wikipedia.org/wiki/Ordered_list

    The term ordered list can refer to: an ordered list (HTML) a mathematical sequence This page was last edited on 29 ...

  4. Glossary of chemistry terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chemistry_terms

    This glossary of chemistry terms is a list of terms and definitions relevant to chemistry, including chemical laws, diagrams and formulae, laboratory tools, glassware, and equipment. Chemistry is a physical science concerned with the composition, structure, and properties of matter , as well as the changes it undergoes during chemical reactions ...

  5. Atom (order theory) - Wikipedia

    en.wikipedia.org/wiki/Atom_(order_theory)

    In the mathematical field of order theory, an element a of a partially ordered set with least element 0 is an atom if 0 < a and there is no x such that 0 < x < a.. Equivalently, one may define an atom to be an element that is minimal among the non-zero elements, or alternatively an element that covers the least element 0.

  6. List of chemistry mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_chemistry_mnemonics

    The order of sequence of atomic orbitals (according to Madelung rule or Klechkowski rule) can be remembered by the following. [2] Order in which orbitals are arranged by increasing energy according to the Madelung rule. Each diagonal red arrow corresponds to a different value of n + l.

  7. Crystal structure - Wikipedia

    en.wikipedia.org/wiki/Crystal_structure

    By definition, the syntax (hkℓ) denotes a plane that intercepts the three points a 1 /h, a 2 /k, and a 3 /ℓ, or some multiple thereof. That is, the Miller indices are proportional to the inverses of the intercepts of the plane with the unit cell (in the basis of the lattice vectors).

  8. Outline of chemistry - Wikipedia

    en.wikipedia.org/wiki/Outline_of_chemistry

    The following outline acts as an overview of and topical guide to chemistry: . Chemistry is the science of atomic matter (matter that is composed of chemical elements), especially its chemical reactions, but also including its properties, structure, composition, behavior, and changes as they relate to the chemical reactions.

  9. Branches of science - Wikipedia

    en.wikipedia.org/wiki/Branches_of_science

    Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science. These branches of natural science may be further divided into more specialized branches (also known as fields).