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Question
Which pair of succesive elements follow increasing order of atomic weight in mendeleev's periodic table?
Which pair of succesive elements follow increasing order of atomic weight in mendeleev's periodic table?
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Solution
The correct option is C Lithium and beryllium
Mendeleev classified the elements on the basis of increasing atomic masses. So accordingly lithium with lesser mass is succeded by beryllium with higher atomic mass. In other cases, calcium has more atomic mass than potassium, nickel is heavier than cobalt and nitrogen is heavier than carbon.
Mendeleev classified the elements on the basis of increasing atomic masses. So accordingly lithium with lesser mass is succeded by beryllium with higher atomic mass. In other cases, calcium has more atomic mass than potassium, nickel is heavier than cobalt and nitrogen is heavier than carbon.
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