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Questions and Answers
Which century did chemists devote much of their efforts to arrange elements in a systematic manner?
Which century did chemists devote much of their efforts to arrange elements in a systematic manner?
- 18th century
- 21st century
- 20th century
- 19th century (correct)
What was the significant feature of the periodic table discovered in the 19th century?
What was the significant feature of the periodic table discovered in the 19th century?
- It classified elements based on their atomic mass
- It included elements that were not yet discovered (correct)
- It predicted the properties of all known elements
- It arranged elements in alphabetical order
What were the vertical columns of the periodic table called?
What were the vertical columns of the periodic table called?
- Periods
- Rows
- Elements
- Groups (correct)
What were the horizontal lines of the periodic table called?
What were the horizontal lines of the periodic table called?
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