Questions and Answers
Which element is a colorless gas and very non-reactive chemically?
Lithium
Which element is a grey metal, much harder than lithium, and fairly reactive chemically?
Boron
Which element reacts readily with oxygen to form H2O and forms HCl with chlorine?
Helium
Which element is a yellow or brown non-metal, very hard, and not very reactive?
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Which element is black, brittle, and non-reactive at room temperature?
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