Why first period is called the shortest period? kpk 9th chemistry// pashto

[@UbaidUllah-m7h]

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[@YasirAfghan-d9t]

Asalam-u-Alaikum Sir ap ke notes ka name kyaa bay our kahaa per milenge

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W.salam
Nice selection
Awr timergara, bajaur Samarbagh batkhela swat mai melty hy