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There are several notations. The subshell notation lists subshells in order of increasing energy, with the number of electrons in each subshell indicated as a superscript. For example, Is2 2S2 2 p 3 means "2 electrons in the Is subs hell, 2 electrons in the 2s subs hell, and 3 electrons in the 2p subs hell. I • I I I I I I I ; • electron deficient compounds ~ compounds that contain at least ; one atom (other than H) that : shares fewer than eight -elec~ trons. ~ • electro negativity ; compare with ionisation energy and electron affinity.

When the gelatin is . , tangle and crosslink, forming a and expands spontaneously: when placed in a larger con- , gel which is a mesh of solid protainer. Molecules in a gas move tein with trapped pockets ofliq, uid inside. Fruit jellies are also freely and are relatively far gels. apart. "vapour" 0 fiten re£ers to ' a gas made of a substance that • gem-dimethyl group is usually encountered as a liq- two methyl groups of the same uid or solid; for example, gas- , carbon atom·. eous H 20 is called "water I • geminal vapour".

Geminal (gem) is a term used to describe a relative 1,1• Gauche probably derives from the , disubstitution. For example the French word for 'crooked'. A hydrogen atoms in gauche conformation repre- dichloromethane may be desents an energy minimum, but scribed as geminal, as may the is not the lowest possible en- , two chlorine atoms. A geminal ergy in the system. This may be or gem diol has two alcohol attributed to the anti con- groups attached in a 1,I-rela, tionship relative to each other.

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