Question

Why nickel place before boron? Nickel has more mass than boron in morden periodic table.

Answer 1

Answer:

hey mate , you r wrong .....

see your modern periodic table again....

●Boron has atomic number 5 and atomic mass 10.8 ....

●Nickel has atomic number 28 and atomic mass 58.7 ....

So, Boron is before Nickel....

I HOPE IT HELPS YOU...

Answer 2

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Mendeleev arranged the periodic table on the basis of relationship between the atomic masses of elements and their physical and chemical properties.

According to Mendeeev's periodic table chemical and physical properties of elements should repeat after certain interval.He arranged the elements in increasing order of atomic mass but there were certain cases which show anomalous position of elements. For example,cobalt was placed before nickel despite having atomic mass greater than that of nickel.

Mendeleev focused more on the periodic properties rather than atomic mass of elements.

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