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 ...

For elements in the first three periods of the periodic table (hydrogen - argon), the orbitals can simply be filled up by increasing energy energy level. A difficulty arises when we come to potassium.