During the 1860s, _ elements were identified and scientists noticed some elements had similar _ and _____ properties. These similarities led to organizing the periodic table.

Before 1860s there was no need of classification or arrangement of elements as very few elements were discovered, but after some time it was observed that it is becoming difficult to define and remember the exact physical and chemical properties of each individual element.

So scientist thought to arrange them in some order based on similar properties

During the 1860s, _____ elements were identified and scientists noticed some elements had similar _____________ and _____________ properties. These similarities led to organizing the periodic table.

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During the 1860s, _ elements were identified and scientists noticed some elements had similar _ and _____ properties. These similarities led to organizing the periodic table.