Basic Chemistry
Column of elements that don't bond
What are noble gasses?
Polyhedron for CN = 4
What is a tetrahedron?
A 180° rotation around an axis
What is an A2 or diad?
[uvw]
What is a crystallographic vector
a ≠ b ≠ c, alpha = gamma = 90°, beta > 90°
What is monoclinic?
Electronic configuration of Mg2+
What is [Ne]? or what is 1s22s32p6?
The coordination polyhedron for CN = 6
What is an octrahedron?
A rotation of 60° around an axis
What is an A6 or hexad?
The vector form the origin to the opposite corner of a unit cell
What is [111]?
What is isometric?
An elements affinity for electrons
What is electronegativity?
Coordination depends on the ratio of ionic radii.
What is the valency principle.
Symmetry through a central point
What is inversion?
<uvw>
What is a set of symmetrically equivelent vectors?
a1 = a2 ≠ c, alpha = beta = gamma = 90°
What is tetragonal?
Bonding that involves gain and loss of electrons
What is ionic bonding?
The sum of the bond charge equals the ionic charge
What is the electrostatic valency principle?
An operation that changes handedness
What is an improper operation?
(hkl)
What is the miller index of a plane?
a1 = a2 ≠ c, alpha = beta = gamma = 120°
What is hexagonal?
Bonding by sharing electrons
What is covalent bonding
Crystal structures have limited numbers of cation sites.
What is the principle of parisonomy?
Rotation og 90° followed by inversion
What is a bar-4 rotoinversion (or A-bar4)?
{hkl}
What is a form?
Isometric Bravais lattice with symbol I
What is body centered cubic?