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  2. Chemical similarity - Wikipedia

    en.wikipedia.org/wiki/Chemical_similarity

    Chemical similarity (or molecular similarity) refers to the similarity of chemical elements, molecules or chemical compounds with respect to either structural or functional qualities, i.e. the effect that the chemical compound has on reaction partners in inorganic or biological settings.

  3. Diagonal relationship - Wikipedia

    en.wikipedia.org/wiki/Diagonal_relationship

    Li is the only group 1 element which forms a stable nitride, Li 3 N. [4] Mg, as well as other group 2 elements, also form nitrides. [4] Lithium carbonate, phosphate and fluoride are sparingly soluble in water. The corresponding group 2 salts are insoluble. (Think lattice and solvation energies). Both Li and Mg form covalent organometallic ...

  4. Pseudohalogen - Wikipedia

    en.wikipedia.org/wiki/Pseudohalogen

    Examples of non-symmetrical pseudohalogen compounds (pseudohalogen halides Ps−X, where Ps is a pseudohalogen and X is a halogen, or interpseudohalogens Ps 1 −Ps 2, where Ps 1 and Ps 2 are two different pseudohalogens), analogous to the binary interhalogen compounds, are cyanogen halides like cyanogen chloride (Cl−CN), cyanogen bromide (Br ...

  5. Isomer - Wikipedia

    en.wikipedia.org/wiki/Isomer

    The most common one in nature (myo-inositol) has the hydroxyls on carbons 1, 2, 3 and 5 on the same side of that plane, and can therefore be called cis-1,2,3,5-trans-4,6-cyclohexanehexol. And each of these cis - trans isomers can possibly have stable "chair" or "boat" conformations (although the barriers between these are significantly lower ...

  6. Analogy - Wikipedia

    en.wikipedia.org/wiki/Analogy

    Analogy is a comparison or correspondence between two things (or two groups of things) because of a third element that they are considered to share. [1]In logic, it is an inference or an argument from one particular to another particular, as opposed to deduction, induction, and abduction.

  7. Comparison - Wikipedia

    en.wikipedia.org/wiki/Comparison

    The description of similarities and differences found between the two things is also called a comparison. Comparison can take many distinct forms, varying by field: To compare is to bring two or more things together (physically or in contemplation) and to examine them systematically, identifying similarities and differences among them.

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  9. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    This can hold up to two electrons. The second shell similarly contains a 2s orbital, and it also contains three dumbbell-shaped 2p orbitals, and can thus fill up to eight electrons (2×1 + 2×3 = 8). The third shell contains one 3s orbital, three 3p orbitals, and five 3d orbitals, and thus has a capacity of 2×1 + 2×3 + 2×5 = 18.