SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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During the discovery of many new elements in the 1800s, it was found that when the elements were arranged in order of increasing atomic mass―
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density increased as the atomic mass increased
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many properties repeated in a regular pattern
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the gases all seemed to be grouped together
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reactivity decreased as the atomic mass increased
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Explanation:
Detailed explanation-1: -The earliest attempt to classify the elements was in 1789, when Antoine Lavoisier grouped the elements based on their properties into gases, non-metals, metals and earths. Several other attempts were made to group elements together over the coming decades.
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