1. welcome

2. wk¶K cwiwPwZ ‡fvjvbv_ ¯^i cÖfvlK ‰fie Av`k© K‡jR wmw×cvkv, AfqbMi, h‡kvi|

3. K‡qKwU ‡gŠj  ‡gŠj ¸wji †Kvb web¨vm †bB|  wPÎ †_‡K †gŠj¸wji ag© ejv m¤¢e bq|  ‡gŠj¸wj †Kvb cÖKvi eÜb MVb Ki‡e ejv m¤¢e bq|

4. ‡gŠ‡ji B‡jKUªb web¨vm H 1 = 1s 1 He 2 = 1s 2 Li 3 = 1s 2 2s 1 Be 4 = 1s 2 2s 2 B 5 = 1s 2 2s 2 2p 1 Sc 21 = 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 1 ‡gŠ‡ji B‡jKUªb web¨vm †_‡K †`Lv hvq wewfbœ AiweUv‡j wM‡q যেমন ( s, p, d,--) B‡jKUªb †kl nq|

5.  B‡jKUªb web¨v‡mi Dci wfwË K‡i †gŠj¸wj‡K †kªYx wef³ Kiv n‡”Q|  ‡kªYx¸‡jv‡K wewfbœ iO Øviv c„_K Kiv n‡q‡Q|  G‡`i †gvU PviwU †kªYx‡Z fvM Kiv n‡q‡Q|

6. cvV wk‡ivbvg B‡jKUªb web¨v‡mi wfwˇZ †gŠ‡ji †kªYxwefvM

7. wb‡`©wkZ D‡Ïk¨/wkLb dj 1| ‡gŠ‡ji †kªYx wefvM Ki‡Z cvi‡e| 2| wewfbœ †kªYxi ˆewkó¨ ej‡Z cvi‡e | 3| wewfbœ †kªYxi †gŠ‡ji D`vniY w`‡Z cvi‡e|

8. B‡jKUªb web¨v‡mi Dci wfwË K‡i †gŠj¸wj‡K Pvi fv‡M fvM Kiv hvq 1. s-block †gŠj 2. p-block †gŠj 3. d-block †gŠj 4. f - block †gŠj ‡gŠ‡ji †kªYxwefvM

9. s - block †gŠj ‡h me †gŠ‡ji cigvYyi B‡jKUªb web¨v‡m †kl B‡jKUªbwU s AiweUv‡j cÖ‡ek K‡i, Zv‡`i‡K s- block †gŠj e‡j| s-block Element

10. Example : S-Block element Bnv s -block †gŠj Bnvi B‡jKUªb msL¨v 11 Bnvi B‡jKUªb web¨vm = 1s 2 2s 2 2p 6 3s 1 Sodium (Na)

11. s - block ‡gŠ‡ji ‰ewkó¨ 1| ch©vq mviwYi MÖ“c IA, IIA Ges k~b¨ MÖ“‡ci He nj s-block †gŠj| 2| s -e­K †gŠj †gvU 14 wU| 3| Giv LyeB mwµq|

12. p- block †gŠj t ‡h me †gŠ‡ji cigvYyi B‡jKUªb web¨v‡m †kl B‡jKUªbwU p AiweUv‡j cÖ‡ek K‡i, Zv‡`i‡K p block †gŠj e‡j| p-block Element

13. Example : P-Block element Bnv p-block †gŠj Bnvi B‡jKUªb msL¨v 82 Bnvi B‡jKUªb web¨vm = 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 4f 14 5s 2 5p 6 5d 10 6s 2 6p 2 LEAD (Pb)

14. p- block ‡gŠ‡ji ‰ewkó¨ 1| ch©vq mviwYi MÖ“c IIIA, IVA,VA, VIA,VIIA, Ges k~b¨ MÖ“‡ci He e¨wZZ Ab¨ me wbw¯Œq M¨vm nj p - block †gŠj| 2| p - block †gŠj †gvU 30 wU 3| G‡`i wKQz avZz, wKQz DcavZz Ges evwK¸‡jv AavZz|

15. d - block †gŠj t ‡h me †gŠ‡ji cigvYyi B‡jKUªb web¨v‡m †kl B‡jKUªbwU d AiweUv‡j cÖ‡ek K‡i, Zv‡`i‡K d e­K †gŠj e‡j| d-Block Element

16. Example : d-Block element Bnv d-block †gŠj Bnvi B‡jKUªb msL¨v 80 Bnvi B‡jKUªb web¨vm = 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 4f 14 5s 2 5p 6 6s 2 5d 10

17. d - block ‡gŠ‡ji ‰ewkó¨ 1| ch©vq mviwYi MÖ“c IB, IIB, IIIB, IVB,VB, VIB,VIIB, Ges VIII MÖ“‡ci †gŠj nj d - block †gŠj| 2| ch©vq mviwYi s I p- block †gŠ‡ji gvSLv‡b G‡`i Ae¯’vb| 3| Giv mevB avZz| 4| GB e­KwU GLbI A¯ú~Y© 5| hw` †Kvb d - block †gŠ‡ji Avq‡bi B‡jKUªb web¨v‡m d -AiweUvj AvswkK c~Y© _v‡K Z‡e Hme d - block †gŠj n‡”Q Ae¯’všÍi †gŠj|

18. f - block †gŠj t ‡h me †gŠ‡ji cigvYyi B‡jKUªb web¨v‡m †kl B‡jKUªbwU f AiweUv‡j cÖ‡ek K‡i, Zv‡`i‡K f block †gŠj e‡j| F-Block Element

19. Example : f-Block element Bnv f-block †gŠj Bnvi B‡jKUªb msL¨v 92 Bnv cÖK…wZ‡Z cÖvß me‡_‡K fvix †gŠj URANIUM (U)

20. f block ‡gŠ‡ji ‰ewkó¨ 1| j¨vš’vbvg cieZ©x 14wU †gŠj Ges A¨vKwUwbqvg cieZ©x 14wU †gŠj GB e­‡Ki AšÍ©fz³| 2| G‡`i MÖ“c me mg‡qi Rb¨ IIIB 3| Giv j¨vš’¨vbvBW I A¨vKwUbvBW bv‡g cwiwPZ|

21. `jMZ KvR U 92 Gi B‡jKUªb web¨vm Ki| Na 11, Ca 20, Cu 29 Gi B‡jKUªb web¨vm Ki Ges 2wU K‡i ˆewkó¨ wjL|

22. evwoi KvR d-block ‡gŠj I Ae¯’vš—i †gŠ‡ji g‡a¨ cv_©K¨| nvB‡Wªv‡R‡bi Ae¯’vb m¤ú‡K© Rvbv|

23. mn‡hvMxZv Kivi Rb¨ Av ন্ত wiKfv‡e ab¨ev`