2. Explaining the trend in ionic radii
Both group 1 and group7 ions increase in size as you go
down the group.
3. Explaining the trend in ionic radii
Both group 1 and group7 ions increase in size as you go
down the group.
This is because as you go down a group the outer level gets
further from the nucleus.
However it is important to distinguish between cations (+ve)
and anions (-ve).
4. Explaining the trend in ionic radii
Both group 1 and group7 ions increase in size as you go
down the group.
This is because as you go down a group the outer level gets
further from the nucleus.
5. Explaining the trend in ionic radii
Both group 1 and group7 ions increase in size as you go
down the group.
This is because as you go down a group the outer level gets
further from the nucleus.
However it is important to distinguish between cations (+ve)
and anions (-ve).
7. Cation ionic radii
When cations (+ve) are formed they lose electrons
Therefore the electron:proton ratio is less. This makes the
force of attraction between the protons and outer electrons
slightly larger
8. Cation ionic radii
When cations (+ve) are formed they lose electrons
Therefore the electron:proton ratio is less. This makes the
force of attraction between the protons and outer electrons
slightly larger
This makes cations smaller than their parent atoms
9. Cation ionic radii
When cations (+ve) are formed they lose electrons
Therefore the electron:proton ratio is less. This makes the
force of attraction between the protons and outer electrons
slightly larger
This makes cations smaller than their parent atoms
Atomic
Element
radius
(nm)
lithium 0.152
Sodium 0.186
potassium 0.231
Rubidium 0.244
10. Cation ionic radii
When cations (+ve) are formed they lose electrons
Therefore the electron:proton ratio is less. This makes the
force of attraction between the protons and outer electrons
slightly larger
This makes cations smaller than their parent atoms
Atomic ionic
Element Ion
radius radius
(nm) (nm)
lithium 0.152 Lithium ion 0.068
Sodium 0.186 Sodium ion 0.098
potassium 0.231 Potassium ion 0.133
Rubidium 0.244 Rubidium ion 0.176
12. Anion ionic radii
When Anions (-ve) are formed they gain electrons
Therefore the electron:proton ratio is more. This makes the
force of attraction between the protons and outer electrons
slightly smaller
13. Anion ionic radii
When Anions (-ve) are formed they gain electrons
Therefore the electron:proton ratio is more. This makes the
force of attraction between the protons and outer electrons
slightly smaller
This makes Anions larger than their parent atoms
14. Anion ionic radii
When Anions (-ve) are formed they gain electrons
Therefore the electron:proton ratio is more. This makes the
force of attraction between the protons and outer electrons
slightly smaller
This makes Anions larger than their parent atoms
Atomic
Element
radius
(nm)
Fluorine 0.064
Chlorine 0.099
Bromine 0.114
Iodine 0.133
15. Anion ionic radii
When Anions (-ve) are formed they gain electrons
Therefore the electron:proton ratio is more. This makes the
force of attraction between the protons and outer electrons
slightly smaller
This makes Anions larger than their parent atoms
Atomic ionic
Element Ion
radius radius
(nm) (nm)
Fluorine 0.064 fluoride ion 0.133
Chlorine 0.099 chloride ion 0.181
Bromine 0.114 bromide ion 0.196
Iodine 0.133 iodide ion 0.219
