whey did the elements in d_block called transition elements?

Answer 1

the properties chemical of an element are due to the external shell of the electrons the transitions elements have on the external shell only 4s2 2 electrons so they re metallic

But ; it is difficult to explain in few words , the energetic calculation show that these elements DIFFER ONLY by the number of electrons in the INTERNAL SUBHELL 3d which has as small influence on their chemistry

Answer 2

just to make clean, f-block components are actually not classed as transition components. ok decrease back on your question, the reason being via making use of certainty the outermost electron in that atom ( or ingredient ) is indoors the utmost power ingredient, that's the d-orbital. This explains why the transition components are d-block components.