3S Elements in Periodic Table

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Table 4707a. 3s elements in periodic table.

1S 2s 3s 4s 5s 6s 7s 2p 3p 4p 5p 6p 3d 3d 4d 5d 6d 4f 5f Elements Structure of the periodic table

Table 4707b. Electron configurations, filling orbitals, and valence electrons of 3s elements

Atomic Number	Symbol	Name	Electron Configuration	Filling Orbital	Valence Electrons
11	Na	Sodium	1s² 2s²p⁶ 3s¹	3s¹	3s¹
12	Mg	Magnesium	1s² 2s²p⁶ 3s²	3s²	3s²

Figure 4707 shows the relation between electron binding energies and atomic number (Z).

Figure 4707. Relation between electron binding energies and atomic number (Z) (at low binding energies).

Practical Electron Microscopy and Database