3.1.3 Halogens

(b) How do halogens react to form ions in redox reactions?

gain an electron to form 1- ions

(d) Describe the trend in reactivity down group 7

• reactivity decreases

• atomic radius and shielding increases

• ease of forming 1- ions decreases (oxidising ability decreases)

(d) What is the trend in oxidising ability of halogens down group 7?

• oxidising ability decreases

• shielding and atomic radius increases down the group

• nuclear attraction decreases

• more difficult to gain an electron to form 1- ions

(d) What is the trend in reducing ability of halide ions down group 7?

Reducing ability increases down the group

(d) Why does reducing ability of halide ions increase down group 7?

• shielding and aic radius increases

• nuclear attraction decreases

• more likely to lose an electron