Chemistry
What is the second most abundant element by mass (about 18.5%) in the human body?
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What symbol appears on the periodic table for Plutonium which has the atomic number 94?
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What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What is the symbol used on the periodic table for the element Protactinium?
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What element forms about 78% of Earth's atmosphere by volume?
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Beryllium, magnesium, calcium, strontium, barium, and radium consist what group of elements?
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Which element has the highest boiling point at 5933.2 Kelvin?
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Which element was the first ever artificially created?
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