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Classification Of Elements And Periodicity In Properties

Question

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Arrange the following ions in order of increasing size:
Be²⁺, Cl^-, S^2-, Na⁺, Mg²⁺, Br^-.

Solution

Order of increasing size,
Be²⁺ < Mg²⁺ < Na⁺ < Cl^- < S^2- < Br^-.

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

Which important property did Mendeleev use to classify the elements in his periodic table?

What are typical elements?

Give the ‘liquid elements’ in the periodic table.

What is valency of an element?

Gallium was named by Mendeleev as

What are magic numbers?

Which property is the basis of long form of periodic table?

How many elements are placed in each period of the p-block?

What is the number of groups in: (i) p-block (ii) d-block?

How many elements are present in:
(i) second period
(ii) fourth period
(iii) sixth period?

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