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What were the criteria used by Mendeléey...

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

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Atomic mass
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What were the criteria used by Mendeleev's in creating his Periodic Table ?

(i) Why do we classify elements ? (ii) What are the two criteria used in the development of Modern Periodic Table ? (iii) State the position of (a) metals, (b) non-metals and ( c) metalloids in the periodic table. (iv) Would you place two isotopes of chlorine, Cl-35 and Cl-37 in different slots of the periodic table because of their different atomic masses or in the same slot because their chemical properties are same ? Justify your answer.

Mendeleev left some gaps in his periodic table.

Besides gallium, which other elements have since been discovered that were left by mendeleev in his Periodic Table ? (Any two)

Besides gallium, which other elements have since been discovered that were left by Mendeleev in his periodic Table ?

What are the uses of Mendeleev periodic law ?

How were transition elements placed in 0 Mendeleev's Periodic Table and (ii) Modern Periodic Table?

(a) Which two criteria did Mendeleev use to classify the elements in his periodic Table? (b) State Mendeleev's periodic law. ( c) Why could no fixed position be given to hydrogen in Mendeleev's Periodic Table ? (d) How and why does the atomic size vary as you go (i) from left to right along a period (ii) down a group ?