An atom of sn (z = 50) has 48 inner (core) electrons, 2 outer electrons, and 2 valence electrons.
The electron configuration of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
1[tex]s^{2}[/tex] 2[tex]s^{2}[/tex] 2[tex]p^{6}[/tex] 3[tex]s^{2}[/tex] 3[tex]p^{6}[/tex] 4[tex]s^{2}[/tex] 3[tex]d^{10}[/tex] 4[tex]p^{6}[/tex] 5[tex]s^{2}[/tex] 4[tex]d^{10}[/tex] 5[tex]p^{2}[/tex]
as it can be observed from the electronic configuration theta there will be
48 inner (core) electron
2 outer electrons
2 valence electrons
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