Halogens- AQA A-Level Chemistry with correct answers

To what group of the periodic table do the halogens belong? Group 7 What is a Halide? Negative ion of a group 7 element 00:13 01:36 What is the colour of Flourine? Pale yellow What is the physical state of Flourine? Gas What is the colour of Chlorine? Green What is the physical state of Chlorine? Gas What is the colour of Bromine? Red-Brown What is the physical state of Bromine? Liquid What is the colour of Iodine? Grey What is the physical state of Iodine? Solid What is the trend in electronegativity down the group and why? Decrease because atomic radius increases and shielding increases so bonding pair of electrons will be further from the nucleus What is the trend in atomic radius down the group? Increase What is the type of structure and bonding shown by the halogens? Simple molecular structure with covalent bonds between atoms and Van-der-Waals between molecules What is the trend in boiling points down the group and why? Increase because as atomic radius increase number of electrons increases meaning Van-der-Waals forces between molecules will be stronger and require larger amounts of energy to overcome In terms of electrons, what happens to halogens when they react? Gain one elctron What is the trend in reactivity down the group and why? Decreases because as atomic radius increases the outer electrons are further away and therefore less attracted to the nucleus What is the trend is oxidising ability of the halogens down the group? Decreases What is the trend in reducing ability of the halides down the group? Increases Which is the strongest oxidising agent? Flourine Which is the strongest reducing agent? Iodide