Hydrogen is a gas at room temperature, and is the first element in the periodic table. It has the chemical symbol H, but is usually found as a diatomic molecule of H2.
<p>It reacts with oxygen to form water.
</p><p>Hydrogen is a colourless, odourless gas that burns and can form an explosive mixture with air. It is the least dense gas known to man. A jet of hydrogen burns in air with a very hot blue flame.
</p><p>Hydrogen is the most abundant element in the universe. It is found most abundantly on Earth in water, but can also be found in the atmosphere in very small amounts.
</p><p>When reactive metals like sodium come into contact with water Hydrogen gas is released.
</p><p>The test for hydrogen is that when a test tube containing hydrogen is placed near a flame it ignites with a “ squeaky Pop”.
</p><p>All metals above Hydrogen in the reactivity series react with acids to displace hydrogen.
</p><p>Hydrogen combines with nitrogen to form ammonia.
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