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प्रश्न
State the modern periodic law.
Answer the following sub-question regarding the modern periodic table:
Write modern periodic law.
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उत्तर
Modern periodic law states that “The physical and chemical properties of all elements are a periodic function of their atomic numbers”.
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संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Give two example of group 1 elements.
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
On which side of the periodic table will you find non-metals?
What is the name of those elements which divide metals and non-metals in the periodic table?
Name the scientist who prepared modern periodic table.
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
How does the chemical reactivity of alkali metals vary on going in group 1 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 is the number of elements is 1st period the modern periodic table?
What is a group in the periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
What are the periods in a periodic table? Give two characteristics of each.
Correct the statement.
Copper and zinc are representative elements.
Name two elements in Alkaline earth metals.
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the periodic table?
Name an element of group 18 which can form compounds.
An element A has 2 electrons in its fourth shell. State its electronic configuration.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Compare Modern Periodic Law with Mendeleev's Periodic Law.
The groups 1 and 2 constitute the _______ block.
The modern periodic table is divided into which blocks?
The modern periodic table shows the molecular masses of the elements in each frame.
To the left of the zig-zag line in the periodic table are the metal elements.
Write an Explanation.
Period
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
Distinguish between:
Group 17 - Group 18
Noble gases belong to______ group of the periodic table.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
The scientist who propounded the modern periodic law is ______.
The element which has the least tendency to lose electrons is ______
The longest period of the Modern Periodic Table is period.
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
An element which is an essential constituent of all organic compounds belongs to
Noble gases are placed in the ______ group in the modern periodic table.
______ group elements are called alkaline earth metals.
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
