Question

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1. what element has the electron configuration kr5s²4d¹⁰5p⁵?

Explanation:

Step1: Find atomic number of Kr

Krypton (Kr) has atomic number 36.

Step2: Count valence electrons

Valence electrons: $5s^24d^{10}5p^5$ → $2+10+5=17$

Step3: Calculate total electrons

Total electrons = 36 + 17 = 53

Step4: Identify element

Atomic number 53 is iodine.

Answer:

Iodine (I)