How many and which blocks are there in modern periodic table ? Write about them
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★ There are 4 blocks in modern periodic table :
1) s-block : contain group 1 and 2 .
2) p-block : contain group 13 to 18 .
3) d-block : contain group 3 to 12 .
4) f-block : contain lanthenide and actinide series .
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