Answer :
Final answer:
In its lowest-energy electron configuration, zinc (Zn) has a filled 3d energy level and a filled 4s energy level. This is because its electron configuration is [Ar] 3d10 4s2.
Explanation:
Zinc's electron configuration
Zinc is a type of atom that has an atomic number of 30. Meaning, it has 30 protons and, in its neutral state, 30 electrons. Looking at the periodic table, we can see that Zinc is part of the d-block, a period 4 element. The general rule for writing electron configurations is to start at hydrogen, and then add electrons as you move across the periods and blocks in order of increasing atomic number.
So, for Zinc, the electron configuration would be written as [Ar] 3d10 4s2. This means that Zinc has a filled 4s energy level with 2 electrons, and a filled 3d energy level with 10 electrons. So, to answer your question, in its lowest-energy electron configuration, zinc has option A: a filled 3d energy level and a filled 4s energy level.
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