what is the basis of the modern periodic table? why lithium with atomic number 3 and potassium with atomic number 19 are placed in group one? What will be the atomic numbers of first two elements in second group?
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The basis of modern periodic table is atomic number
Lithium with atomicnumber 3 and potassium with atomic number 19 are placed in same group because they are having the same number of valence electron that is 1 .
The first and second element in the the second group will be beryllium and magnesium with atomic number 4 and 12 respectively.
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