The electronic configuration of the elements of the second group of the second period is 1s²2s²2 1s2 2p6 3s2 3p64s² or 2,8,8,2
To determine the external electronic configuration of an element, knowing the number is needed. Electrons and usage configuration rules (or electron energy levels).
The number of electrons in a neutral atom is the same as the number of protons.
The number of protons is the atomic number of the element. The
elements are arranged in the periodic table according to their atomic number.
The elements of group 2 are calcium and magnesium
The atomic number, number of protons, and number of electrons of group 2 elements are 40
Now we can distribute the electrons according to the structural rules:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
The outer shell has n = 2, so the outer electron configuration is 4s²
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