[DSE化學2018]同學準備好DSE CHEM未? (2)

果3個係transition metal既general properties
要記曬 佢會要求你舉例 但唔會要你解釋 因為dse解唔到
oxidation state知common果d ok唔洗特登去背其他

嚴格嚟講呢
TM 唔係咁分
Various colour
Different oxidation state
As catalyst 只不過係properties of TM
面唔係用嚟判斷佢係唔係TM
通常用嚟判斷佢地係唔係TM
係有無incomplete d orbital
有人會話Sc唔係 但亦都有人話係
因為佢得兩個oxidation state
但呢樣野係唔夠準確
因為lanthanide actinides 既element
都有幾個oxidation state
U: +5 +6 但佢地唔係TM
但Zn 就唔算係TM 因爲zn2+/zn 都係d10
唔會有dd transition 所以唔算TM

Color無意思
只需要知道transition metals have more than one oxidation state就夠
所以D block element每個period既頭同尾都唔係transition metal e.g. Scandium and Zinc

呢個唔駛知點解
因為顏色 同 d orbital splitting 有關
Splitting 受ligand 同 geometry 影響
所以就算有相同 oxidation state 都可以唔同色
但一定common 例子要識
Cu2+ 係水同NH3 既color

唔會叫你prove佢係咪transition metal 呢d係事實野黎(Sc/Zn果d另計)
只係會叫你講下transition metal有咩general properties
要解既話要上到大學 用d orbital去解

btw好高興大家咁熱烈討論
不過唔介意既話 請儘量用dse既語言去講 同埋唔好夾雜太多beyond中學level既case
唔係既話其他人睇會好難跟
呢個係我少少請求

periodicity (2 and 3 period)
同埋general properties of transition metals (fact only)

hydride 都要？