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Chemistry

Roshan Azeez
08/08/2019 0 0

Que: On what basis did Mendeleev arrange elements in the periodic table?

Ans: Mendeleev arranged elements based on Atomic mass

Periodic table

Modern periodic table consists of 18 groups and seven periods. Items are arranged based on atomic number. The modern periodic table takes care of limitations in Mendeleev's periodic table.

 

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Mathematics average
Que : Average of 5 consecutive even numbers is 12 . Find the sum of 1st and last numbers. Sol : shortcut... If consecutive numbers average is given, then average is (1st + last)/2 = 12 Therefore sum of 1st and last = 12*2 = 24

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