I am the lightest of my group and can ignite with a mere spark, yet I am essential for water. What element am I?

Category: Science · Difficulty: expert

Hint: Think of the gas that fuels stars and our sun.

Answer

Hydrogen

Explanation

Hydrogen is the lightest element, highly flammable, and combines with oxygen to form water.

This is a expert science riddle — one of the harder riddles here. The answer is Hydrogen.

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