Flashcards in Chemistry Deck (17):
An n- type semiconductor is a covalent solid in which
the energy gap is very small. the charge carries are negative (electrons)
In a covalently conded solid, the bonding is produced by
Sharing of electrons between adjacent atoms (diamond case or SI)
statements about atomic parking in a crystal lattice
Packing fraction for HCP lattice is the same as for FCC lattice
the intercepts of a crystallographic plane with the three crystallographic axes, x,y,z, are expressed as fractions of the unit cell dimensions along a given direction. Thus, the intercepts of (120)plane are:
If the hardening of alloy is induced by diffusion controlled precipitation of second phase particles, then the rate of hardening is
exponentially dependent on temperature
metallic corrosion statements
Iron corrodes substantially when in contact with zinc, in an aqueous environment.
statement about toughness of a material
high hardness is an indication of high toughness
the nucleus of a neutral atom contains 42 protons and 54 neutrons
how many protons, neutrons and electrons are in an ion rhodium isotope. 103 Rh3+
atom #=45 (Rh)( periodic table)
neutrons= atomic mass-Protons
compound does contain a covalent bond
all compounds with Hydrogen "H" always forms covalent bonds and No is covalent.
find the element in the periodic table and if its negative go right, if its positibe go left and it should end up in the noble gas section if not then is not a noble gas.
how many valence electrons does an element, arsenic from group 5A have?
element number 33-(accommodate shells 2+8+18)=28
ground-state electron configuration of a barium ion, Ba2+
look the periodic table
number of electrons 56
the same as Xe
percentage by mass of carbon in the hydrocarbon propane, C3 H8
when a nonmetallic element in group 6A reacts to form an ionic compound, the element usually gains an ionic charge of?
group 6A are two electrons short of a noble gas configuration