Multiple Choice
Which of the following is the approximate effective nuclear charge (Z_eff) experienced by a valence electron in a bromine (Br) atom?
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10. Periodic Properties of the Elements
Periodic Trend: Effective Nuclear Charge
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What is the identity of an element when the effective nuclear charge of its valence electrons is 18 while its shielding constant is 5?
A
P
B
Ar
C
N
D
V
E
Al
Verified step by step guidance1
Understand the concept of effective nuclear charge (Z_eff), which is the net positive charge experienced by valence electrons. It is calculated using the formula: Z_eff = Z - S, where Z is the atomic number and S is the shielding constant.
Given that the effective nuclear charge (Z_eff) is 18 and the shielding constant (S) is 5, set up the equation: 18 = Z - 5.
Solve for the atomic number (Z) by rearranging the equation: Z = 18 + 5.
Calculate the atomic number (Z) using the equation from the previous step.
Identify the element with the atomic number obtained in the previous step by referring to the periodic table.
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