CHEM 1A03 Lecture Notes - Lecture 10: Electron Configuration, Sulfur, Ionic Radius
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14 Oct 2017
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3. 2. 1 - define the terms first ionisation energy and electronegativity. The energy required to remove one mole of electrons from one mole of atoms in the gaseous state. This shows how tightly the outer-shell electrons are held in an atom. Metals tend to have low ionisation energies because their outer electrons are easily removed. A measure of the attraction an atom has for a for a shared pair of electrons when it is covalently bonded to another atom. Metals have low electronegativities because they lose electrons easily. Non-metals have high electronegativities as they gain electrons to complete their outer shell. Electronegativity tends to increase across a period and up a group. http://ibscrewed4chemistry. blogspot. com/ 3. 2. 2 - describe and explain the trends in atomic radii, ionic radii, first ionisation energies, electronegativities and melting point for the alkali metals and the halogens. Moving down a group, the atomic radii increases.
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