What were the criteria used by Mendeleev in creating his Periodic Table?

Academic Chemistry NCERT Class 10

Mendeleev used the relationship between the atomic masses of the elements and their physical and chemical properties. He used similarity in physical properties, similarity in the formation of hydrides and oxides of element.

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Updated on: 13-Mar-2023

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What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which posed a challenge to Mendeleev's Periodic Law.
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his periodic table?
(a) State Mendeleev’s periodic law.(b) What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table ? (e) Which group of elements was missing from Mendeleev’s original periodic table?
Why do we classify elements?What were the two criteria used by Mendeleev in creating his Periodic Table?Why did Mendeleev leave some gaps in his Periodic Table?In Mendeleev's Periodic Table, why was there no mention of Noble gases such as Helium, Neon and Argon?Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
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?
(a) On what basis did Mendeleev arrange the element in his periodic table.(b) On what basis are they arranged now?
Mendeleev's basis for the Periodic Table is ____________.
(a) Why do we classify elements?(b) What were the two criteria used by Mendeleev to classify 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-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?ChlorineSiliconOxygenGermanium
What Is Mendeleev Table
What type of plants were used by Mendel for conducting his experiments on inheritance?
What is the Periodic Table?
(a) How were the positions of isotopes of an element decided in the modern periodic table?(b) How were the positions of cobalt and nickel resolved in the modern periodic table? (c) Where should hydrogen be placed in the modern periodic table? Give reason for your answer.
What are the criteria used to classify living things?
What were the materials used by people in ancient times in place of clothes?

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