3A.2 ionic radii and polarisation of ions

Question 1

what happens to ions as you go down the group

Answer 1

as you go down the group ions have more electron shells therefore ions get larger

Question 2

what are isoelectronic ions

Answer 2

different atoms with different protons numbers that have the same number of electrons

Question 3

what happens to the ionic radius when the protons increases

Answer 3

the radius would decrese since the nuclear charge increases pulling the electrons closer to the nucleus

Question 4

what is the anion

Answer 4

it is the negative ion

Question 5

what is the cation

Answer 5

the positive ion

Question 6

what is polarisation

Answer 6

the distortion of the electron density of a negative ion

Question 7

what are the two factors that increase the process of polarisation

Answer 7

1. high charge (of ions) of the cation and the anion
2. small size of the cation
3. and the large size of the anion

Question 8

polarization energy

Answer 8

it is the ability of positive ions to distort the electron density of a neighboring negative ion

Question 9

how can we find charge density

Answer 9

charge density = charge of atom/ the ionic radius (this can tell us the approximant value of polarization energy)

Question 10

what is important to remember when measuring the ionic radii

Answer 10

1. the environment of an ion (for example it is important how many oppositely charged ions are touching the co-ordination number )
2. the nature of an ion