Question

select the correct answer.
which element has the electron configuration xe 6s² 4f¹⁴ 5d¹⁰ 6p²?
a. gold (atomic number 79)
b. mercury (atomic number 80)
c. lead (atomic number 82)
d. potassium (atomic number 19)
e. copper (atomic number 29)

Explanation:

Step1: Find atomic number of Xe

Xenon (Xe) has an atomic number of 54, so it has 54 electrons.

Step2: Calculate total electrons from configuration

The electron configuration is \([Xe] 6s^2 4f^{14} 5d^{10} 6p^2\). Add the electrons from each subshell: \(54 + 2 + 14 + 10 + 2 = 82\).

Step3: Match atomic number to element

An atomic number of 82 corresponds to lead. Check other options: Gold (79), Mercury (80), Potassium (19), Copper (29) don't match 82.

Answer:

C. lead (atomic number 82)