What is common feature of electronic configuration of elements at the end of period 2 and period 3 of periodic table

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Solution

II period elements have electronic configuration as 1s²2s^1-22p^1-6
For ex
Li- 1s²2s¹
Be- 1s²2s²
B- 1s²2s²2p¹
Ne- 1s²2s²2p⁶

III period elements have electronic configuration as 1s²2s²2p⁶3s^1-23p^1-6
For ex
Na- 1s²2s²2p⁶3s¹
Mg- 1s²2s²2p⁶3s²
Al- 1s²2s²2p⁶3s²3p¹
Ar- 1s²2s²2p⁶3s²3p⁶

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Similar questions

The electronic configuration of an element X is 2,8,6. What is the group and period number of element X in the periodic table?

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2} 3 p^{3}

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