![]() ![]() The 1s subshell has to be filled first before the 2s subshell and so on. Aufbau principle states that in the ground state of an atom or the ion, electrons will fill the atomic orbitals of the lowest available energy levels before occupying the higher energy levels. However, the actual configuration is Ar 4s1 3d5. ![]() ![]() Zn has 30 electrons whereas Zn ion has 28 electrons. Here, to write the electronic configuration, the rules assigned by Aufbau principle are to be noted. Chromium (24 electrons) has an expected configuration of Ar 4s2 3d4. Zn (zinc) loses two electrons and is converted into a Zn ion. Zinc is having the atomic symbol $Zn$ which has the atomic number 30 and therefore belongs to the group of transition elements. We shall see what Aufbau principle is and based on this let us write the electronic configuration of the given atom. Electronic configuration 1s22s22p63s23p64s23d10 or Ar3d104s2. Zinc should not be defined as a transition metal because it has the A r 4 s 3 d 2 1 0 electron configuration and it forms the Z n 2 + ion which has the A. In the previous chapters of general chemistry, we have studied about the finding of the number of protons, neutrons and electrons and also about several rules assigned for the filling of electrons in an orbital like Pauli’s exclusion principle, Aufbau principle and so on. is full, the next ten elements (the d block elements, Sc to Zn) use the 3d orbitals. (Zn) Zinc is a chemical element of the periodic table with chemical symbol Zn and atomic number 30 with an atomic weight of 65.382 u and is classed as transition metal and is part of group 12 (zinc group). Hint: The answer to this question lies in the concept of chemistry which tells about writing the electron configuration based on knowing the atomic number and based on the Aufbau principle. Electron configurations of transition metal elements. ![]()
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