Question

1. choose the correct electron configuration for the element. refer to the periodic table. zn ar 4s² ar 4s²3d¹⁰ ar 4s²3d⁶ ar 4s²3d⁸ 20) choose the correct electron configuration for the element. refer to the periodic table. fe ar 4s² ar 4s²d¹⁰ ar 4s²3d⁹ ar 4s²3d⁶

Explanation:

1. For Zn (atomic number 30): Argon (Ar) has 18 electrons. Zn has 12 additional electrons. The 4s orbital fills first with 2 electrons, then the 3d orbital fills completely with 10 electrons, giving the configuration [Ar] 4s²3d¹⁰.
2. For Fe (atomic number 26): Argon (Ar) has 18 electrons. Fe has 8 additional electrons. The 4s orbital fills with 2 electrons, then the remaining 6 electrons occupy the 3d orbital, giving the configuration [Ar] 4s²3d⁶.

Answer:

1. [Ar] 4s²3d¹⁰
2. [Ar] 4s²3d⁶