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Which element has two valence electrons in the s sublevel of the fourth energy level ​

Which element has two valence electrons in the s sublevel of the fourth energy level ​
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Which element has two valence electrons in the s sublevel of the fourth energy level ​

User OMAK
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The element is americium, a metal from the actinides. The element is in Period 4 and Group 2. Even though the 4s sublevel is filled, the last electron went into that sublevel, making it a member of the s-block. It has 2 valence electrons.
User Peter McKenzie
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