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What is the abbreviated electron configuration of Sn ?

Answer
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Hint :We know that to answer this question the information of tin atomic number must be known. The tin has an atomic number of 50, which means tin has  50 electrons. Thus, Aufbau’s principle will be utilized to solve the question.

Complete Step By Step Answer:
The electronic configuration can be described via Aufbau’s principle. This principle states that the electrons of an atom or ions, that are in ground state, For example, the electrons first enter to 1s then 2s then 2p, 3s, 3p, 4s, 3d  . The atom or ions are most stable when the s, p, d, f orbital are fully or half filled with electrons.
Thus, tin (Sn) has an atomic number 50. It means it has  50 electrons. Tin (Sn) has an atomic number 50. Here, as the electron of tin reaches and fulfill the vacant orbitals it would be filling the vacant orbitals it would be 1s, 2s,2p,3s,3p,4s,3d,4p,5s,4d and 5p orbitals.
The noble gas Krypton has an electron configuration of 1s22s22p63s23p64s23d104p65s24d105p2
So we can replace this portion of tin's electron configuration with the noble gas notation  [Kr]
  [Kr]=5s24d105p2.
Therefore, the abbreviated electron configuration of Sn is 5s24d105p2 .

Note :
Aufbau’s principle describes the manner of electrons filled in an atomic orbital of an atom in the ground state configuration. The principle stated that, based on the energy level of atomic orbital electron fills happen. The electron fills to the respective atomic orbital happens with the fact that lowest energy orbitals are first occupied by electrons, if they are completely filled then in the higher energy level orbitals start to be occupied by electrons.