The group 1 elements are all soft, reactive metals with low melting ... gases - Edexcel The group 0 elements, the noble gases, are all unreactive non-metal gases. They show trends in their ...

Like all noble gases, xenon is colourless, odourless and inflammable — but it is also more reactive ... based on its non-toxicity and low environmental impact (compared with halocarbons ...

The earliest attempt to classify the elements was in 1789, when Antoine Lavoisier grouped the elements based on their properties into gases, non-metals ... in group 1 are reactive metals, and ...