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Mendeleev's periodic table helped in cor...

Mendeleev's periodic table helped in correct determination of atomic masses of elements

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State Mendeleev.s periodic law.

(a) Why do we classify elements ? (b) What were the two criteria used by Mendeleev in creating 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.

Statement-1 : In Mendeleev's periodic table arrangement of elements depend on their atomic weight. Statement-2 : Some vacant sites were present in this periodic table. Statement-3 : Position of isotope was well explained by Mendeleev

In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

In the periodic table, with the increase in atomic number the metallic nature of elements

Name or state with reference to the elements of the modern periodic table. The element with the largest atomic size from the elements of period-1, 2 and 3

(a) What was the basis of Mendeleev's Classification of elements ? (b) List two achievements of Mendeleev's periodic tables. (c) List any two observations which posed a challenge to Mendeleev's periodic law.

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 ?

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 ?

Which group of elements could be placed in mendeleev's periodic table without disturbing the original order ? Give reason.

ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-TRUE OR FALSE TYPE QUESTIONS
  1. Justify the given statement with suitable examples -"the properties of...

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  2. Why do you think the noble gases are placed in a separate group?

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  3. All groups were subdivided into A and B sub groups in Mendeleev's peri...

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  4. Mendeleev's periodic table helped in correct determination of atomic m...

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  5. What is modern periodic law? Mention the important features of the lon...

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  6. What are transition elements ? How these differ from representative el...

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  7. Find out the Value ofequilibrium constant for the following reaction a...

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  8. In the fifth period 5s, 5p and 5d shells are filled.

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  9. Isotopes of an element are placed at the same place in the long form o...

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  10. The element with Z = 11 is present in the third period.

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  11. All lanthanides are supposed to be present in group 3 of the periodic ...

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  12. Atomic radius of F is greater than that of Ne.

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  13. Al^(3+) is smaller than Ca^(2+).

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  14. Explain why : The second ionisation energy of Li is very high.

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  15. np electrons are more penetrating than ns electrons.

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  16. The electron affinity of nitrogen is zero.

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  17. The electron affinity increases in going down a group.

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  18. Melting and boiling points increase regularly in going across the seco...

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  19. Melting point of LiCI is less than that of NaCl.

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  20. CsOH is more basic than Ba(OH)(2).

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