Arre, across period 2, nucleus pull badhta hai, electrons same shell mein hain, isliye squeeze ho jata hai. Sodium mein, naya energy level shuru hota hai, toh radius phail jaata hai. Par yeh bookish baat hai. Mera life ka reason? Mera papa, plumber, kehta hain — jaise chhote pipe mein zyaada pressure, same baat atom ke andar bhi. Lekin sodium ko naya pipe milega, toh woh faila dega! Usi tarah.
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