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Chemistry(g17)2
The document discusses how properties of halogens change down the periodic table from fluorine to iodine. The atomic and ionic radii increase with proton number, while the number of electronic shells remains the same. The intermolecular forces holding molecules together, such as van der Waals forces, get weaker with increasing size and number of electrons. As a result, melting and boiling points decrease as volatility increases from fluorine to iodine.
Chemistry(g17)2
- 1. F C l2Br 2 I 2 At ATOMIC ION IC RADIUS EFFECTIVE NUCLEAR CHARGE REMAIN ALMOSTCONSTANT INCREASE WITH PROTON NUMBER NUMBER OF ELECTRONIC SHELLS INCREASE BUTHALOGENS VOLTALITY MELTING BOILING POINT INTERMOLECULAR FORCES THAT HOLD MOLECULES TOGETHER IN SOLID & LIQUID HALOGENS van der Waals force Less volatile Size & total no. Of electron in the intermolecular van der Waals force. Melting pt. & boiling pt. cause resultColour (dark) with proton number Stronger force, the melting pt. & Boiling pt. Cl2 Br2 &I2 reactive Non elements Notfound Element state In nature Colour intensity down the group G17