We are asked to identify the element with electron configuration 1s22s22p63s23p64s13d9.
When finding the identity of the element, you’ll have to identify the atomic number of that element. Recall that every single element in the periodic table has a corresponding atomic number.
The atomic number of an element is always equal to the number of protons of that element. And when the element is neutral (charge = 0), the number of protons is equal to the number of electrons.
Neutral element: Atomic number = # protons = # of electrons
The electron configuration 1s22s22p63s23p64s13d9 refers to the excited state of what element?
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