SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Compared to other periodic tables in his time, the table developed by Dmitri Mendeleev ―
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arranged elements in order of increasing atomic number
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enabled him to predict chemical and physical properties of yet undiscovered elements
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had all elements arranged in perfect order of increasing atomic mass
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was the only one that arranged elements into groups by ion size
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Explanation:
Detailed explanation-1: -He corrected the known atomic masses of some elements and he used the patterns in his table to predict the properties of the elements he thought must exist but had yet to be discovered. He left blank spaces in his chart as placeholders to represent those unknown elements.
Detailed explanation-2: -Therefore, the main difference between Mendeleev’s and Moseley’s arrangements of elements in the periodic table is that Mendeleev arranged elements ascendingly according to atomic masses, while Moseley arranged them ascendingly according to atomic numbers.
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