Write electronic conf. Of s block
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Element Electronic configuration
Lithium 1s22s1
Sodium 1s22s22p63s1
Potassium 1s22s22p63s23p64s1
Rubidium 1s22s22p63s23p63d104s24p65s1
Caesium [Xe]6s1
Francium [Rn]7s1
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