231What is the chemical symbol for mercury?
232What is the chemical symbol for tungsten?
233Which element is considered the most abundant element in the entire universe?
234Which element is the most abundant element in Earth’s crust by mass?
235Which gas makes up the largest percentage of Earth’s atmosphere?
236Which is the lightest of all known chemical elements?
237Which metal is considered the lightest of all metals?
238Diamond, one of the hardest known natural substances, is a crystalline form of which element?
239Which element has the atomic number 1?
240Which element has the atomic number 6?
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