What is the element corresponding to the electron configuration [Kr] 5s² 4d¹⁰ 5p⁵?

The electron configuration provided, [Kr] 5s² 4d¹⁰ 5p⁵, indicates that this element has 35 electrons beyond those in the noble gas krypton [Kr].

To analyze this configuration, start by breaking it down:

• The [Kr] represents the electron configuration of krypton, which accounts for 36 electrons.

• The 5s² denotes 2 electrons in the 5s subshell.

• The 4d¹⁰ indicates that the 4d subshell is fully filled with 10 electrons.

• The 5p⁵ indicates there are 5 electrons in the 5p subshell.

When adding the numbers together:

• Krypton contribution: 36 electrons

• 5s² contribution: 2 electrons

• 4d¹⁰ contribution: 10 electrons

• 5p⁵ contribution: 5 electrons

Total: 36 + 2 + 10 + 5 = 53 electrons.

The element with an atomic number of 53 is iodine (I), which fits the electron configuration stated. The correct answer corresponds to the unique arrangement of electrons in the shells surrounding the nucleus.

Understanding the context:

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