They make up the d-block and are the transition elements.
s-block: groups 1 and 2 p-block: groups 13 - 18 d-block: groups 3 - 12 f-block: lanthanides and actinides
s block elements: groups 1-2 d block elements: groups 3-12 p block elements: groups 13-18
This is because the D-Block in the Periodic Table is where the d-Subshell is being filled up. Chromium's d-Subshell is being filled up and is therefore in the D-Block.
The d-block of the periodic table is often referred to as the transition metals. They are:ScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercuryLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCopernicium
group 3 to group 12 elements
The s, p, d, f block realte to the filling of the outer shell orbitals. Group 1 and 2 are the s block. Groups 13-18 the p block, the transition metals the d block and the lanthanides and actinides the f block.
transition metals or d-block elements
Transition Metals group 3 to group 12 elements
Transition Metals group 3 to group 12 elements
transition metals have electrons in d orbitals that take part in bonding. T the s and p block elements have no d electrons that take part in bonding, the bonding electrons are all in s and p orbitals. The period 3 and above s and p block elements do have empty d orbitals that take part in bonding.
S block elements- valence electrons are filling the s orbitals D block elements- valence electrons are filling the d orbitals P block elements- valence electrons are filling the p orbitals F block elements- valence electrons are filling the f orbitals