enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   Each distinct atomic number therefore corresponds to a class of atom: these classes are called the chemical elements. [5] The chemical elements are what the periodic table classifies and organizes. Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on.

3. Mass number - Wikipedia

   en.wikipedia.org/wiki/Mass_number

   The mass number should also not be confused with the standard atomic weight (also called atomic weight) of an element, which is the ratio of the average atomic mass of the different isotopes of that element (weighted by abundance) to the atomic mass constant. [9] The atomic weight is a mass ratio, while the mass number is a counted number (and ...

4. 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.

5. Atomicity (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Atomicity_(chemistry)

   Atomicity is the total number of atoms present in a molecule of an element. For example, each molecule of oxygen (O 2) is composed of two oxygen atoms.Therefore, the atomicity of oxygen is 2.

6. 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 ...

7. ISO 31-8 - Wikipedia

   en.wikipedia.org/wiki/ISO_31-8

   Ratio of the average mass per atom of an element to 1/12 of the mass of an atom of the nuclide 12 C one 1 Formerly called atomic/molecular weight. Example: A r (Cl) = 35.453. Both quantities depend on the nuclidic composition. relative molecular mass: M r: Ratio of the average mass per molecule or specified entity of a substance to 1/12 of the ...

8. Electron configurations of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Electron_configurations_of...

   Atomic Spectroscopy, by W.C. Martin and W.L. Wiese in Atomic, Molecular, & Optical Physics Handbook, ed. by G.W.F. Drake (AIP, Woodbury, NY, 1996) Chapter 10, pp. 135–153. This website is also cited in the CRC Handbook as source of Section 1, subsection Electron Configuration of Neutral Atoms in the Ground State.

9. Template:List of oxidation states of the elements - Wikipedia

   en.wikipedia.org/wiki/Template:List_of_oxidation...

   Element Negative states Positive states Group Notes −5 −4 −3 −2 −1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 Z; 1 hydrogen: H −1 +1: 1 2 helium: He 0 18