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प्रश्न
What is meant by periodicity of elements?
उत्तर
The recurrence of similar properties of elements after certain regular intervals when they are arranged in the order of increasing atomic numbers is called periodicity.
Concept Insight: Periodicity in properties is due to the repetition of similar outer electronic configuration of elements at certain regular intervals.
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संबंधित प्रश्न
The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.
In which part of a group would you separately expect the elements to have the greatest metallic character
In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?
In each of the following pair, choose the atom having the bigger size:
(a) Mg (At. No.12) or Cl (At. No.17)
An element 'M' has atomic number 12.
(a) Write its electronic configuration.
(b) State the group to which 'M' belongs.
(c) Is 'M' a metal or a non-metal.
(d) Write the formula of its chloride.
What will be the valency of an element of atomic number 9 (nine)?
What is modern periodic law?
Arrange the following in increasing order of property indicated
SiO2, P2O5, SO3, Cl2O7 (acidic nature)
How many elements are there in period 2?
Select the correct answer from the options given below.
Is the group number of the element whose atomic number is 4.
