Q18 of 181 Page 282

How were the positions of cobalt and nickel resolved in the modern periodic table ?

In modern periodic table the elements are placed according to their atomic number so cobalt is 27 and nickel is 28, so in modern periodic table cobalt comes first and then Nickel.


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What is the significance of atomic number in the modern classification of elements ? Explain with the help of an example.

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How were the positions of isotopes of an element decided in the modern periodic table ?

 18

Where should hydrogen be placed in the modern periodic table ? Give reason for your answer.

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On which side of the periodic table will you find metals ?