Video narration
Ei tebiltar emon odbhut akar keno - eta ki shudhu mukhosto korar jonno banano? Skuler seating chart-er moto bhabun: obosthan dekhei sari ar kolam bojha jay. Periodic table-o temon ekti manchitro, elomelo talika noy. Protiti element, orthat podartho toiri kora moulo, atomic number onujayi sajano. Atomic number holo poromanur kendre thaka proton-er shonkha. Shonkha bam theke dane bare; ekti sari shesh hole porer sarite cholte thake. Ebar asal morota dekhun. Urddhomukhi protiti group-e thaka element-gulor rashayonik acharon onekta kachakachi - eki noy, kintu shomporkito. Karon tader electron binyase kichu pattern abar fire ase. Tai tebiler fak, sari ar kolamer akar kono sajsojja noy; egulo acharoner punorabritti chokhe dekhay. Obosthan janle kono element-er boishishto shomporke agei dharona korte paren. Tahole uttor? Ei odbhut tebileti talika noy: atomic number krom thik kore, ar er akar eki dhoroner element-ke eksathe shohoje khuje pete shahajjo kore.