Transcript Transition Metals - Salem Community Schools

Transition Metals
TRANSITION METALS LOSE DIFFERENT
NUMBERS OF ELECTRONS EVEN THOUGH
THEY ALL HAVE 2 VALENCE ELECTRONS.
Iron chloride
There are two different compounds that contain iron and
chlorine:
FeCl2
FeCl3
These two compounds are not the same, so we can not give
them the same name.
FeCl2
 We know that chlorine wants to gain one electron.
 Therefore the iron must lose two electrons, since
there are two chlorines.
 This gives the iron a +2 charge because it loses 2
negative electrons.
 This is written Fe+2 or Fe++
FeCl3
 We know that chlorine wants to gain one electron.
 Therefore the iron must lose three electrons, since
there are three chlorines.
 This gives the iron a +3 charge because it loses 3
negative electrons.
 This is written Fe+3 or Fe+++
Names?
 FeCl2 is called Iron(II) chloride because each iron
atom is losing two electrons.
 FeCl3 is called Iron(III) chloride because each iron
atom is losing three electrons.
 The Roman numerals in the parenthesis is the
number of electrons lost by one atom of the
transition metal.
What is the formula?
 What is the formula for Copper(I) bromide?
 What is the formula for Iron(III) oxide?
 Try these, then go to the next frame for the answer
Answers!
 What is the formula for Copper(I) bromide?
 Bromine always gains one electron and the copper
wants to lose one electron.
 Therefore the formula is CuBr.
Rust
 What is the formula for Iron(III) oxide?
 Oxygen wants to gain two electrons.
 Iron wants to lose three electrons in this case. (III)
 You will need two iron atoms to lose 6 electrons and
three oxygen atoms to gain 6 electrons.
 The formula is Fe2O3.