Aare period mein left se right jaate waqt nucleus ka pull badhta hai, electrons tight ho jaate hain, isliye atomic radius ghatta hai! Lekin sodium mein new energy level shuru hota hai, outer electron dur chala jaata hai, isliye radius badh jaata hai. Par mere coaching waale sir ne yeh ratwa diya tha, diagram bana ke samjhaya bhi nahi! Main toh roz subah 4 baje uth ke yeh sab ratta maarta hoon, kyunki ghar pe koi science padha nahi sakta, aur na hi mai coaching ke alawa doubt poochh sakta hoon.
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