Q18 of 60 Page 138

How does the electronic configuration of an atom relate to its position in the modern periodic table?

The modern periodic table contains of groups and periods.

The atoms with identical outer shell electronic cell electronic configuration are in the same groups.


The atoms with same number of shells are in same period.


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16

Which amongst the following elements whose atomic number is given below belong to the same period?

Give reason. 17, 10, 20, 12, 19, 15.

 17

What were the achievements of Mendeleev’s periodic table? What was the basis of the classification of elements in it?

 19

The elements of the second period of the periodic table are given along:

Li Be B C N O F


(a) Give a reason to explain why atomic radii decrease from Li to F.


(b) Identify the most:


(i) Metallic


(ii) Non-metallic elements.

 20

The elements of the 3rd period of the periodic table are given along:

Na Mg Al Si P S Cl


(a) Which is more non-metallic S or Cl?


Na Mg Al Si P S Cl


(b) Which has a higher atomic mass: Al or Cl?