(a) How is the electronic configuration of an element related to its position in the modern periodic table? Give one example.
(b) Why is nitrogen more electronegative than phosphorus?
(a) By the electronic configuration of an element, we can identify the group and period to which the atom belongs.
For example - Oxygen has atomic number 8.
Its electronic configuration is 2, 6.
As it can gain two electrons to complete its octet, so it belongs to group 16. Also, since the electrons are filled in two shells. So, oxygen belongs to the second period.
(b) As we move down the group, electronegativity of elements decreases as the atomic size increases. Nitrogen is placed above phosphorus in group 15. So, nitrogen is more electronegative than phosphorus.
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