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Question- How does the effective nuclear charge experienced by the valence electrons of an atom vary going from left to right across a period of the periodic table?

a) Going from left to right across a period, nuclear charge increases while the number of electrons in the core is constant. This results in a increase in Zeff.

b) Going from left to right across a period, nuclear charge remains approximately the same while the number of electrons in the core decreases. This results in a increase in Zeff.

c) Going from left to right across a period, nuclear charge decreases while the number of electrons in the core is constant. This results in a decrease in Zeff.

d) Going from left to right across a period, nuclear charge remains approximately the same while the number of electrons in the core increases. This results in a decrease in Zeff.

I just need a general explanation of it please- Thanks

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