1. the D block Flashcards
most of the elements in the d block are
transition elements
the d block is in the _____ of the periodic table
middle
definition of a transition element
a transition element is a d-block element that can form at least one stable ion with an incomplete d subshell
how is chromium unusual
prefers to have one electron in each orbital of the 3d subshell and just 1 in the 4s subshell (gives it more stability)
Cr = 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5
how is copper unusual
copper prefers to have a full 3d subshell and and just one electron in the 4s subshell (gives it more stability)
Cu=1s2, 2s2, 2p6, 3s2, 3p6, 4s1. 3d10,
copper forms a stable Cu2+ ion by loosing 2 electrons.
the Cu2+ ion has an incomplete d subshell
Cu2+ = 1s2, 2s2, 2p6, 3s2, 3p6, 4s, 3d9
3d orbitals are occupied ______ at first only double up when they have to
singly
when ions are formed the _ electrons are removed first (then the d electrons)
s electrons
why arent scandium and zinc transition elements
cant form stable ions with incomplete d-subshells
Sc3+
Zn2+