Textbook Question
Consider the isoelectronic ions F- and Na+. (c) Repeat this calculation using Slater’s rules to estimate the screening constant, S.
10. Periodic Properties of the Elements
Periodic Trend: Effective Nuclear Charge
Multiple Choice
What is the effective nuclear charge (Zeff) for a bromine (Br) atom with an atomic number of 35?
A
17
B
35
C
28
D
7
Verified step by step guidance1
Identify the atomic number (Z) of bromine, which is 35. This represents the total number of protons in the nucleus and the total number of electrons in a neutral atom.
Understand that the effective nuclear charge (Zeff) is the net positive charge experienced by an electron in a multi-electron atom. It accounts for the shielding effect caused by inner-shell electrons.
Use the formula for effective nuclear charge: Zeff = Z - S, where Z is the atomic number and S is the shielding constant.
Estimate the shielding constant (S) for bromine. The shielding constant can be approximated by considering the number of inner-shell electrons that shield the outer electrons from the full nuclear charge.
Subtract the shielding constant (S) from the atomic number (Z) to calculate the effective nuclear charge (Zeff) for bromine: Zeff = 35 - S.
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