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H Hydrogen which is the lightest element that is highly flammable element and He Helium the second lightest element with no fire risk. This is why helium is used in making balloons than hydrogen which is much lighter than helium.

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13y ago
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9y ago

That depends on the specific star. However, in most cases the most common element is hydrogen, followed by helium.

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Q: A star is comprised mostly of what two elements?
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