Diamond crystals are:
Octahedral in shape and are giant metallic crystals.
Tetrahedral in shape and are giant atomic crystals.
Octahedral in shape and are giant ionic crystals.
Octahedral in shape and are giant atomic crystals.
The hardest natural substance ever known is:
Diamond.
Sulphur.
Carbon.
Graphite.
As the atomic number of group IV elements increases:
Their first ionization energies increases.
The +4 oxidation becomes less stable.
+2 oxidation becomes less stable.
All are correct.
Diamond is a non-conductor of electricity because:
There are no free electrons in its crystal lattice since all of the five valence electrons are used in bonding.
There are no free ions in its crystal lattice since all of the three valence electrons are used in bonding.
There are no free electrons in its crystal lattice since all of the four valence electrons are used in bonding.
There are free electrons in its crystal lattice since all of the four valence electrons are not used in bonding..
The outer electronic configuration for group 14 elements is:
ns²np².
ns²np⁴.
ns²np³.
ns¹np³.
