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  2. Nonmetal - Wikipedia

    en.wikipedia.org/wiki/Nonmetal

    Radon is the most metallic of the noble gases and begins to show some cationic behavior, which is unusual for a nonmetal; [96] and; In extreme conditions, just over half of nonmetallic elements can form homopolyatomic cations. [o] Examples of nonmetal-like properties occurring in metals are:

  3. Nonmetallic material - Wikipedia

    en.wikipedia.org/wiki/Nonmetallic_material

    Some textbooks use the term nonmetallic elements such as the Chemistry of the Non-Metals by Ralf Steudel, [25]: 4 which also uses the general definition in terms of conduction and the Fermi level. [ 25 ] : 154 The approach based upon the elements is often used in teaching to help students understand the periodic table of elements, [ 26 ...

  4. List of alternative nonmetal classes - Wikipedia

    en.wikipedia.org/wiki/List_of_alternative...

    Classes provided an economy of description and are beneficial to structuring knowledge and understanding of science. [1] The distinction between classes is not absolute. Boundary overlaps can occur as outlying elements in each class show or begin to show less-distinct, hybrid-like, or atypical properties. As expressed by Nelson: [2]

  5. Properties of metals, metalloids and nonmetals - Wikipedia

    en.wikipedia.org/wiki/Properties_of_metals...

    The most stable form is the black allotrope, which is a metallic looking, brittle and relatively non-reactive semiconductor (unlike the white allotrope, which has a white or yellowish appearance, is pliable, highly reactive and a semiconductor). When assessing periodicity in the physical properties of the elements it needs to be borne in mind ...

  6. Molecule - Wikipedia

    en.wikipedia.org/wiki/Molecule

    Several non-metallic elements exist only as molecules in the environment either in compounds or as homonuclear molecules, not as free atoms: for example, hydrogen. While some people say a metallic crystal can be considered a single giant molecule held together by metallic bonding , [ 20 ] others point out that metals behave very differently ...

  7. Non-metallic inclusions - Wikipedia

    en.wikipedia.org/wiki/Non-metallic_inclusions

    Non-metallic inclusions that arise because of different reactions during metal production are called natural or indigenous. They include oxides , sulfides , nitrides and phosphides . Apart from natural inclusions there are also parts of slag , refractories , material of a casting mould (the material the metal contacts during production) in the ...

  8. Pnictogen - Wikipedia

    en.wikipedia.org/wiki/Pnictogen

    Nitrogen and bismuth, despite both being pnictogens, are very different in their physical properties. For instance, at STP nitrogen is a transparent non-metallic gas, while bismuth is a silvery-white metal. [12] The densities of the pnictogens increase towards the heavier pnictogens. Nitrogen's density is 0.001251 g/cm 3 at STP. [12]

  9. Glossary of biology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_biology

    This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...