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4541 CHEMISTRY      Chapter 4  E GROUP 17 ELEMENTS 1. Write the symbol of elements in Group 17. Fluorine           Chlorine             Bromine             Iodine          2. Group 17 elements are known as …………..……… 3. Halogens exist as diatomic molecules.{ F2, Cl2, Br 2, I2 } 4. Halogens have …..…… valence electrons. 5. All Group 17 elements are non-metals. 6. Shade in the boxes for all the element in Group 17 i n the Periodic Table of Elements : 17 7. Write the proton number and electron arrangement : Elements Proton number Electron arrangement F 9 2.7 Cl 17 2.8.7 Br 35 2.8.18.7 I 53 2.8.18.18.7 At 85 2.8.18.32.18. 7 8. Physical properties of elements in Group 17 : (i) Complete the tab le below : El ement Symbol Proton Number Electron Arrangement Melting point / o C Boiling point / o C Physical state at room Temp. Colour Flourine F 9 -220 -188 Pale yellow Chlorine Cl 17 -101 -34 Greenish- yellow Bromine 35 2.8.18.7 -7 59 Reddish- brown Chapter 4 The Periodic Table of Elements 14 Proton number : ………….…... Number of protons : …………… Number of electrons : ………… Number of shells occupied with electrons : …………...… Atomic size : ………………  Going down the group :

Chemistry C4B Notes(S) Halogen

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