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constitutes 90% of all matter in the uni...

_____ constitutes 90% of all matter in the universe and is the lightest element known.

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for an element that constitutes 90% of all matter in the universe and is the lightest element known. 2. **Identifying the Element**: The element that fits this description is Hydrogen. It is known to be the most abundant element in the universe. 3. **Hydrogen's Characteristics**: Hydrogen is not only the most abundant element but also the lightest. It has an atomic number of 1 and is represented by the symbol 'H'. ...
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