Question

1. choose the correct electron configuration for the element. refer to the periodic table.

zn
ar 4s²3d⁶
ar 4s²3d⁸
ar 4s²3d¹⁰
ar 4s²

1. choose the correct electron configuration for the element. refer to the periodic table.

fe
ar 4s²3d⁶
ar 4s²
ar 4s²3d⁸
ar 4s²d¹⁰

Explanation:

Step1: Determine the atomic number of Zn

Zinc (Zn) has an atomic number of 30. Argon (Ar) has an atomic number of 18. So, we need to account for \(30 - 18=12\) more electrons.

Step2: Fill the orbitals

According to the Aufbau principle, after \(4s\) (which can hold 2 electrons), we fill the \(3d\) orbitals (\(3d\) can hold 10 electrons). So the electron configuration is \([Ar]4s^{2}3d^{10}\)

Step3: Determine the atomic number of Fe

Iron (Fe) has an atomic number of 26. Argon (Ar) has an atomic number of 18. So, we need to account for \(26 - 18 = 8\) more electrons.

Step4: Fill the orbitals

After filling \(4s^{2}\) (2 electrons), we fill the \(3d\) orbitals. The \(3d\) orbitals for Fe have 6 electrons. So the electron configuration is \([Ar]4s^{2}3d^{6}\)

Answer:

1. \([Ar]4s^{2}3d^{10}\)
2. \([Ar]4s^{2}3d^{6}\)