It's been difficult to explain patterns of toxic mercury in some parts of the world, such as why there's so much of the toxin deposited into ecosystems from the air in the southeastern United States, ...

This film discusses the halogens, specifically chlorine, bromine, and iodine, detailing their preparation from naturally occurring salts and their chemical properties. The film demonstrates various ...

Sodium and chlorine react vigorously when heated, giving an orange flame and clouds of white sodium chloride.

We use aluminum foil every day, but it can be quite reactive under the right circumstances. This gif shows aluminum reacting with bromine, a halogen. Aluminum foil sticks out of the test tube and ...

Group 1 - the alkali metals - Edexcel Group 0 - the noble gases - Edexcel Sample exam questions - groups in the periodic table - Edexcel ...