Please answer 3rd,4th and 5th question
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In question 3rd this realeted to book
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3.s block has one or two electrons
p block has1-6 electrons
d block has 1 to 10 electrons
f block has 1 to14 electrons
these all electrons are in outermost shell
4 Li,Be,B
5.mendeleev divided his periodic table into 8 groups and 7 periods. while modern periodic table has 7periods and 18 groups
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