Question

use the periodic table to determine the electron configuration for dysprosium (dy) and americium (am) in noble - gas notation.
dy:
xe6s²6f¹⁰
xe6s²4f¹⁰
rn6s²6f¹⁰
rn6s²4f¹⁰
am:
rn7s²4f⁷
rn7s²5f⁷
rn7s²6f⁷
rn7s²7f⁷

Explanation:

Step1: Determine the noble - gas core for Dysprosium (Dy)

Dysprosium has an atomic number of 66. The noble - gas core before Dy is Xenon (Xe) with an atomic number of 54. After the noble - gas core, we fill the remaining electrons. The 6s orbital fills before the 4f orbital. The electron configuration of Dy is \([Xe]6s^{2}4f^{10}\).

Step2: Determine the noble - gas core for Americium (Am)

Americium has an atomic number of 95. The noble - gas core before Am is Radon (Rn) with an atomic number of 86. After the noble - gas core, the 7s orbital fills first, and then the 5f orbital. The electron configuration of Am is \([Rn]7s^{2}5f^{7}\).

Answer:

Dy: \([Xe]6s^{2}4f^{10}\)
Am: \([Rn]7s^{2}5f^{7}\)