Which group of elements could be placed in Mendeleev’s ′ Periodic Table without disturbing the original order? Give reason.

Academic Chemistry NCERT Class 10

Noble gases that are chemically unreactive hence can be placed in the periodic table in the form of a separate group.

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Updated on: 10-Oct-2022

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How could the modern periodic table remove various anomalies of Mendeleev’s 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?
Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table.
In Mendeleev’s periodic table, gaps were left for the elements to be discovered later. Which one of the following elements found a place in the periodic table later?GermaniumChlorineOxygenSilicon
In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with an atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give a reason for the same.
(a) State the periodic law on which Mendeleev’s periodic table was based. Why and how was this periodic law changed ?(b) Explain why, the noble gases are placed in a separate group.
Consider the following elements:20Ca, 8O, 18Ar, 16S, 4Be, 2He Which of the above elements would you expect to be: (i) very stable? (ii) in group 2 of the periodic table? (iii) in group 16 of the periodic table?
Give examples of alkaline metals present in Group-1 in 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.
(a) State the merits of Mendeleev’s classification of elements.(b) Describe two anomalies of Mendeleev’s periodic classification of elements.
(a) List any three observations which posed a challenge to Mendeleev’s Periodic law.(b) How does the metallic character of elements vary on moving from(i) left to right in a period,(ii) from top to bottom in a group of the Modem Periodic Table?Give a reason for your answer.
Name two elements whose properties were predicted on the basis of their positions in Mendeleev’s periodic table.
(a) What is meant by (i) a group, and (ii) a period, in a periodic table?(b) How many periods and groups are there in the long form of periodic table? (c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.
Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements. Write an example of a compound formed with(a) chlorine (Group 17 of Periodic Table)(b) oxygen (Group 16 of Periodic Table)
(a)In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?(b) Why could no fixed position be given to hydrogen in Mendeleev’s periodic table?

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