Classify each statement about effective nuclear charge, Zeff, as true or false E
ID: 986146 • Letter: C
Question
Classify each statement about effective nuclear charge, Zeff, as true or false
Effective nuclear charge is dependent on the number of electrons present in an atom.
In a Be atom, a 1s electron has a greater Zeff than a 2s electron.
Across a period, as Zeff increases, atomic size decreases.
Electrons in a p orbital are more effective than those in other orbitals at shielding other electrons from the nuclear charge.
A 1s electron in a Be atom has a smaller Zeff than a 1s electron in a Li atom.
Effective nuclear charge decreases from left to right across a period on the periodic table.
Explanation / Answer
Effective nuclear charge is dependent on the number of electrons present in an atom. - TRUE, since the Zeff = Z - S, hence the value S is included in the calculation
Across a period, as Zeff increases, atomic size decreases- True, since the size decreases down the period and Zeff increases across the period
Electrons in a p orbital are more effective than those in other orbitals at shielding other electrons from the nuclear charge - True, shielding order is s > p > d > f
Effective nuclear charge decreases from left to right across a period on the periodic table- False