Question

why effective nuclear charge increase as we go left to right along a period

Answer 1

The atomic size generally decreases across a period.

This is because within a period the outer electrons are in the same valence shell and the effective nuclear charge increases as the atomic number increases resulting in the increased attraction of electrons to the nucleus.

Note: Atomic radii of noble gases are not considered here.There radii values are very large.

Hope this helps.

Answer 2

Hey buddy,

First let me explain you two terms

1)Screening effect/Shielding effect

The inner shell electrons prevent the nuclear charge from reaching the outer shell, so called screening effect

2) Effective nuclear charge

it is the charge experianced by outer most electrons

see, as screening effect increases, effective nuclear charge decreases

as we go across a period, the size of the atom goes on decreasing, so it is quiet easy for the nuclear charge for reaching the outer shell ( inner shell electrons remain constant)
so effective nuclear charge increases

Hope u got the concept
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