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পর্যায় সারণীর '''dডি-ব্লক''' এর উপাদানগুলো সেইসকল গ্রুপের উপাদান নিয়ে গঠিত যাতে, সর্বোচ্চ শক্তির ইলেকট্রনগুলো d-অর্বিটালে অবস্থিত। ডি-ব্লক এলিমেণ্টগুলোকে [[ট্রানজিশন মেটাল]] বা অবস্থান্তর ধাতু বলা হয়ে থাকে।
লুটেটিয়াম ও লরেন্সিয়াম মৌল d-ব্লকে অবস্থিত হলেও তাদের অবস্থান্তর ধাতু বলা হয় না।<ref>[http://www.iupac.org/reports/provisional/abstract04/connelly_310804.html IUPAC Provisional Recommendations for the Nomenclature of Inorganic Chemistry (2004)] (online draft of an updated version of the "''Red Book''" IR 3-6)</ref>
{{পর্যায় সারণী (ডি-ব্লক)}}
<center>
{| border="0" cellpadding="0" cellspacing="1" style="width:80%; {{{1|}}}"
|+ '''d-ব্লকের রাসায়নিক উপাদানসমূহ'''
|-
! width="1.0%" | [[Periodic table group|Group]] →
! width="5.5%" | [[Group 3 element|3]]
! width="5.5%" | [[Group 4 element|4]]
! width="5.5%" | [[Group 5 element|5]]
! width="5.5%" | [[Group 6 element|6]]
! width="5.5%" | [[Group 7 element|7]]
! width="5.5%" | [[Group 8 element|8]]
! width="5.5%" | [[Group 9 element|9]]
! width="5.5%" | [[Group 10 element|10]]
! width="5.5%" | [[Group 11 element|11]]
! width="5.5%" | [[Group 12 element|12]]
|-
! ↓ [[Periodic table period|Period]]
| colspan="19"|<br />
|-
! [[Period 4 element|4]]
| {{element cell|21|scandium |Sc|44.955912(6) |Solid|Transition metals|Primordial}}
| {{element cell|22|titanium |Ti|47.867(1) |Solid|Transition metals|Primordial}}
| {{element cell|23|vanadium |V |50.9415(1) |Solid|Transition metals|Primordial}}
| {{element cell|24|chromium |Cr|51.9961(6) |Solid|Transition metals|Primordial}}
| {{element cell|25|manganese |Mn|54.938045(5) |Solid|Transition metals|Primordial}}
| {{element cell|26|iron |Fe|55.845(2) |Solid|Transition metals|Primordial}}
| {{element cell|27|cobalt |Co|58.933195(5) |Solid|Transition metals|Primordial}}
| {{element cell|28|nickel |Ni|58.6934(2) |Solid|Transition metals|Primordial}}
| {{element cell|29|copper |Cu|63.546(3) |Solid|Transition metals|Primordial}}
| {{element cell|30|zinc |Zn|65.39(2) |Solid|Transition metals|Primordial}}
|-
! [[Period 5 element|5]]
| {{element cell|39|yttrium |Y |88.90585(2) |Solid|Transition metals|Primordial}}
| {{element cell|40|zirconium |Zr|91.224(2) |Solid|Transition metals|Primordial}}
| {{element cell|41|niobium |Nb|92.90638(2) |Solid|Transition metals|Primordial}}
| {{element cell|42|molybdenum|Mo|95.94(1) |Solid|Transition metals|Primordial}}
| {{element cell|43|technetium|Tc|[97.9072] |Solid|Transition metals|Natural radio}}
| {{element cell|44|ruthenium |Ru|101.07(2) |Solid|Transition metals|Primordial}}
| {{element cell|45|rhodium |Rh|102.90550(2) |Solid|Transition metals|Primordial}}
| {{element cell|46|palladium |Pd|106.42(1) |Solid|Transition metals|Primordial}}
| {{element cell|47|silver |Ag|107.8682(2) |Solid|Transition metals|Primordial}}
| {{element cell|48|cadmium |Cd|112.411(8) |Solid|Transition metals|Primordial}}
|-
! [[Period 6 element|6]]
| {{element cell|71|lutetium |Lu|174.967(1) |Solid|Lanthanides|Primordial}}
| {{element cell|72|hafnium |Hf|178.49(2) |Solid|Transition metals|Primordial}}
| {{element cell|73|tantalum |Ta|180.94788(2) |Solid|Transition metals|Primordial}}
| {{element cell|74|tungsten |W |183.84(1) |Solid|Transition metals|Primordial}}
| {{element cell|75|rhenium |Re|186.207(1) |Solid|Transition metals|Primordial}}
| {{element cell|76|osmium |Os|190.23(3) |Solid|Transition metals|Primordial}}
| {{element cell|77|iridium |Ir|192.217(3) |Solid|Transition metals|Primordial}}
| {{element cell|78|platinum |Pt|195.084(9) |Solid|Transition metals|Primordial}}
| {{element cell|79|gold |Au|196.966569(4) |Solid|Transition metals|Primordial}}
| {{element cell|80|mercury |Hg|200.59(2) |Liquid|Transition metals|Primordial|mercury (element)}}
|-
! [[Period 7 element|7]]
| {{element cell|103|lawrencium |Lr|[262.110] |Solid|Actinides|Synthetic}}
| {{element cell|104|rutherfordium|Rf|[263.1125] |Solid|Transition metals|Synthetic}}
| {{element cell|105|dubnium |Db|[262.1144] |Solid|Transition metals|Synthetic}}
| {{element cell|106|seaborgium |Sg|[266.1219] |Solid|Transition metals|Synthetic}}
| {{element cell|107|bohrium |Bh|[264.1247] |Solid|Transition metals|Synthetic}}
| {{element cell|108|hassium |Hs|[269.1341] |Solid|Transition metals|Synthetic}}
| {{element cell|109|meitnerium |Mt|[268.1388] |Solid|Transition metals|Synthetic}}
| {{element cell|110|darmstadtium |Ds|[272.1463] |Solid|Transition metals|Synthetic}}
| {{element cell|111|roentgenium |Rg|[272.1535] |Solid|Transition metals|Synthetic}}
| {{element cell|112|ununbium |Uub|[277] |Liquid|Transition metals|Synthetic}}
|}
</center>
== আরো দেখুন ==
| 