Question

On the basis of electronic configuration around the nucleus how will you find I)chemically similar elements
II)group of halogen
III)group of inert gas
IV)first elements of the period​

Answer 1

Answer:

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If the element is 2，7

and another element is 2，8，7.The last number is the same.Means they are similar

2.If the numbers end in 7 it is halogens

3.If the numbers end in 8 it is noble gas

4.If it ends with one