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Questions and Answers
Which element was discovered thousands of years ago in its elemental form?
Which element was discovered thousands of years ago in its elemental form?
- Gold (Au) (correct)
- Carbon (C)
- Technetium (Tc)
- Oxygen (O)
Which element is radioactive and was discovered only because of technology developed during the twentieth century?
Which element is radioactive and was discovered only because of technology developed during the twentieth century?
- Carbon (C)
- Technetium (Tc) (correct)
- Oxygen (O)
- Gold (Au)
During which century did the number of known elements more than double from 31 to 63?
During which century did the number of known elements more than double from 31 to 63?
- 20th century
- 18th century
- 17th century
- 19th century (correct)
Who published nearly identical classifications of elements in 1869?
Who published nearly identical classifications of elements in 1869?
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What made it easier to isolate elements from their compounds during the early 19th century?
What made it easier to isolate elements from their compounds during the early 19th century?
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