<span>I believe that its
Cu</span>
"n" represents principal energy level or principal quantum number. Principal energy levels are then subdivided into sublevels. The level of principal energy level is always equal to number of sublevels. Therefore if <span>principal energy level</span> = 4, then there are also 4 sublevels present, namely: 4s, 4p, 4d and 4f sublevels.
The <span>ion that is formed by providing the second ionization to remove an electron is </span><span>N3-. The answer is letter B. The rest of the choices do not answer the question above.</span>
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