Forget 10 Downing Street or 1600 Pennsylvania Avenue, the most prestigious address in the universe is number one in the periodic table, hydrogen. In science, simplicity and beauty are often equated - ...

In most periodic tables hydrogen (H ... and chemical properties and show trends. The table below shows the melting points of most elements in group 1. Melting points are a physical property ...

They react with metals to form metal halides, and with hydrogen to form acidic ... Sample exam questions - groups in the periodic table - Edexcel Understanding how to approach exam questions ...

And this is not to mention the related debates in which some experts argue, rather plausibly, that hydrogen should be placed at the top of the halogen group and helium should be moved to the head of ...