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Classification Of Elements And Periodicity In Properties

Question

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Which one out of O and Se is bigger in size and why?

Solution

Selenium has bigger atomic size because it comes after oxygen in the group (O, Se) and down the group size of atom increase.

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

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?

What is the name given to the s-block elements?

To which block the element with outer electronic configuration 4s²3d¹⁰ belongs?

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