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प्रश्न
Write the merits of the modern periodic table over Mendeleev’s Periodic table
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उत्तर
1) Elements are arranged on the basis of increasing atomic number which is more fundamental.
2) Isotopes of an element can be placed along with parent element.
3) It explains periodicity of properties of elements configuration.
4) Lanthanides and actinides are placed separately.
5) Anomalous pairs of elements like Ar and K having same atomic mass could be justified
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संबंधित प्रश्न
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
How were the positions of isotopes of an element decided in the modern periodic table?
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
State how the valency of elements varies in a group of the periodic table?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
What are the periods in a periodic table? Give two characteristics of each.
Give the group number of following elements present in periodic table
Name the scientist who stated the modern periodic law.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
Name an alkali metal in period 3 and halogen in period 2.
Name the noble gas with 3 shells.
How will the tendency to gain electrons change as we go from left to right across a period? Why?
State the modern periodic law.
What is meant in the periodic table by a period?
What is the number of elements in the 3rd period, of the modern periodic table?
An element A has 2 electrons in its fourth shell. State its electronic configuration.
Give the chemical formula of sodium hydroxide
Give the chemical formula of carbonic acid
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
What are the elements.
p-block is composed of groups 1 and 2.
Explain structure of modern periodic table in short.
Noble gases belong to______ group of the periodic table.
What are groups and periods in the modern periodic table?
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
The amount of energy released when one or more electrons is added to the neutral atom is ______
Which of the following statements about the Modern Periodic Table is correct:
An element which is an essential constituent of all organic compounds belongs to
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
Match the atomic number with the following:
An element of group 2.
Give reason for the following:
Inert gases do not form ion.
