Why does Zeff increase from left to right in a periodic tabel?
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The effective nuclear charge is the net positive charge experienced by valence electrons.
Equation:
Zeff = Z-s
where Z is atomic number and s is the number of shielding electrons.
effective nuclear charge increases across a period because electrons are added into the same energy shell and they are pulled more strongly by nucleus.
example :
fluorine has more effective nuclear charge than oxygen.
Aluminum=atomic number 13.
so Zeff=13-10=3+
silicon =atomic number 14
so Zeff=14-10=4+
Equation:
Zeff = Z-s
where Z is atomic number and s is the number of shielding electrons.
effective nuclear charge increases across a period because electrons are added into the same energy shell and they are pulled more strongly by nucleus.
example :
fluorine has more effective nuclear charge than oxygen.
Aluminum=atomic number 13.
so Zeff=13-10=3+
silicon =atomic number 14
so Zeff=14-10=4+
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