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What were the two criteria used by Mende...

What were the two criteria used by Mendeleev in creating his periodic table?

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Mendeleev.s periodic table was based on the observation that the properties of elements are the periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals.
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What were the criteria used by Mendeléev in creating his Periodic Table?

(a) Why do we classify elements? (b) What were the two criteria used by Mendeleev to classifiy the elements in his periodic table? (c) Why did Mendeleev leave some gaps in his periodic table? (d) In Mendeleev's periodic table, why was there no mention of noble gases like helium neon and argon? (e) Would you place the two isotopes of chlorine, Cl-35 and Cl-27 in different slots because of their different atomic masses or in the same slot because theri chemical properties are the same? Justify your answer.

What werer the two factors on which Mendeleev based the creation of his periodic table ?

The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on?