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Questions and Answers
What is the total number of known elements at present?
What is the total number of known elements at present?
- 1865
- 31
- 118 (correct)
- 63
When did the number of identified elements more than double to 63?
When did the number of identified elements more than double to 63?
- 1865 (correct)
- Present day
- 1800
- Man-made elements era
What led scientists to search for a systematic way to organize their knowledge of elements?
What led scientists to search for a systematic way to organize their knowledge of elements?
- Discovery of man-made elements
- Difficulty in studying individual elements and compounds (correct)
- Increase in the number of known elements
- Development of periodic table
What is the purpose of classifying elements in a systematic framework?
What is the purpose of classifying elements in a systematic framework?
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What does the classification of elements lead to after certain regular intervals?
What does the classification of elements lead to after certain regular intervals?
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Study Notes
Elements and Classification
- Currently, there are a total of 118 known elements.
- The number of identified elements more than doubled to 63 in 1869.
- The need to search for a systematic way to organize knowledge of elements arose due to the rapid increase in the number of discovered elements.
- Classifying elements in a systematic framework serves the purpose of making it easier to understand their properties, relationships, and trends.
- The classification of elements leads to the emergence of periodic patterns and recurring trends after certain regular intervals, facilitating the prediction of properties of unknown elements.
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