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character: Cesium
topic: Precision Timekeeping
grade: 9
subject: Chemistry
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character: Atomic Clocks
topic: Importance of Cesium in Precision Timekeeping
grade: 9
subject: Chemistry
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character: Frequency Standards
topic: Precision Timekeeping Techniques
grade: 9
subject: Chemistry
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character: Time Measurement
topic: Role of Elements in Timekeeping
grade: 9
subject: Chemistry
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