Interpretation: Reason due to which size of the atoms of the elements in a periodic table decreases from left to right in a period is to be given.
Concept introduction: A period is a horizontal row consisting of elements in the increasing order of their
Answer to Problem 54A
It happens because effective nuclear charge increases as we go from left to right in a period.
Explanation of Solution
Shielding effect increases as the number of shells increase in an atom. When going from left to right in a period, no new shell gets added up due to which neither the size nor the shielding effect of electrons increases. However an electron get added up at each step in the same type of orbital and also the number of protons in the nucleus increases due to which the effective nuclear charge increases that pulls the electrons towards itself thereby decreasing the size of atoms.
The size of atoms decreases as we move from left to right in a period because effective nuclear charge increases as we go from left to right in a period.
Chapter 11 Solutions
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