Video narration
Tumi ki jano, mohabishwer oshonkho podarthoke ki sotyi koyekti ghorer manchitre bojha jay? Bhabo, bohutol ek alamari: protiti ghore rakha ache ekti kore moulo. Ei sajano almaritei adhunik porjay saroni - moulo chenar ekti manchitro. Ghor gulo elomelo noy. Moulogulo parmanobik shongkha, orthat nucleus-er proton shongkha, barar krome bose. Ar nirdishto byobodhane tader vouto o rashayonik dhormo abar fire ashe. Ei holo ashol mor: protikgulo alada tothyo noy; obosthanei niyomti prokash kore. Eki ullomb kolamer group-e bairer electron binyas kachakachi, tai rashayonik acharoneo mil dekha jay. Onubhomik shari, orthat period, janay - notun prodhan shoktistor shuru hoyeche. Manchitro porle diknirdesho mele - bamdike prodhanoto dhatu, dandike odhatu, ar majher shirir moto shimay upodhatu. Niche alada rakha Lanthanides o Actinides-o ei almarir-i ghor; jayga banchatei tara niche dekhano hoy. Tai uttor hya: ei choto ghor guloi moulogulor porichoy, mil ar acharon bojar manchitro - ogochhalo bhirke ek nojore pathjoggo kore.