Classify each statement about effective nuclear charge, Zef, as true or false. F
ID: 715622 • Letter: C
Question
Classify each statement about effective nuclear charge, Zef, as true or false. False True Electrons in an s orbital Effective nuclear charge a period on the periodic from left to right across are more effective than those in other orbitals at shielding other electrons from the nuclear charge. A 1s electron in a B atom Effective nuclear charge does not has a smaller Zeft than a depend on the number of 1s ctable. Across a period, as Zeff increases, atomic size decreases. electron in a Be atom.electrons present in an atom In a N atom, a 1s electron has a greater Zeff than a 2s electronExplanation / Answer
1) True : Electrons in s orbital are more effective than those in other orbitals at shielding other electrons from the nuclear charge.(expl: s orbit e's are closest to nucleus)
2) True: Across a period, as Zeff increases atomic nuclear charge decrease (exp: Zeff increases due to increase in nucleur charge)
3) False : Effective nucleur charge decreases from left to right across a period in a periodic table ( expl: Zeff increases because of increase in nuclear charge across a period)
4) False: A 1s electron of B atom has smaller Zeff than a 1s electrons in a Be atom (exp: Because Zeff increases across the table)
5) Zeff doesnot depend on no. Of electrons present in an atom.( exp : Zeff depends on average e's i.e Zeff= Z- S where S are av sheilding electrons.
6) In a N atom; a 1s e has greater Zeff than 2s e (exp: 1s has more shielding e's than 2s .Thus 2s has more Zeff )