d-block trends

Question 1

trend in the melting point when going from Sc to Cr

Answer 1

increases, there are more electrons available for metallic bonding

Question 2

trend in the melting point when going form Fe to Zn

Answer 2

decreases, the increase in nuclear charge becomes strong enough and makes fewer electrons available for metallic bonding

Question 3

what is the exception to the melting point trends

Answer 3

Mn due to its 4s2, 3d5 config.

Question 4

what are the trends in metallic radius?

Answer 4

MR decreases going across the period due to the increasing nuclear charge, pulling the valence electrons in closer.

Question 5

what is the exception for the metallic radius trends?

Answer 5

Mn, Cu and Zn see an increase in the atomic radii due to the electron-electron repulsions being stronger than the nuclear charge (Zeff.)

Question 6

what is the trend in ionisation energies across the period

Answer 6

they increase due to the increasing nuclear charge, making electrons harder to loose.

Question 7

why is the 3rd ionisation of Fe2+ take less energy than in Mn2+?

Answer 7

due to the fact the Mn 2+ is 3d6 (paired electron) and Fe2+ is 3d5 (unpaired).

the unpaired is easier to remove than the paired despite the nuclear charge increasing.

Question 8

from Sc to Mn the maximum OS is equal to the ___

Answer 8

group number

Question 9

from Fe to Zn what is the trend in the oxidation states?

Answer 9

no real trend, just have to be in states lower than their group number.

this is because the nuclear charge is to strong and prevents further electrons from being removed.