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Classification of Elements and Periodicity in Properties
What are the defects of long form of the periodic table?
1. Position of hydrogen. Hydrogen shows similarities with both metals(alkali metals) and non-metals (halogens) but it is placed with alkali metals.
2. Position of helium. It is kept along with p-block elements.
3. Position of lanthanoids and actinoids. They are kept outside the main body of the periodic table.
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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?
Why are there 10 elements in each series of d-block?
In terms of electronic configuration,
what is common in a given period and group?
Give the general electronic configuration of
(i) Transition elements (ii) Inner transition elements.
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