1. the D block

Question 1

most of the elements in the d block are

Answer 1

transition elements

Question 2

the d block is in the _____ of the periodic table

Answer 2

middle

Question 3

definition of a transition element

Answer 3

a transition element is a d-block element that can form at least one stable ion with an incomplete d subshell

Question 4

how is chromium unusual

Answer 4

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

Question 5

how is copper unusual

Answer 5

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

Question 6

3d orbitals are occupied ______ at first only double up when they have to

Answer 6

singly

Question 7

when ions are formed the _ electrons are removed first (then the d electrons)

Answer 7

s electrons

Question 8

why arent scandium and zinc transition elements

Answer 8

cant form stable ions with incomplete d-subshells
Sc3+
Zn2+