Question 1
According to band theory, the element having all of its bonding molecular orbitals filled and all of its antibonding orbitals empty in the 4
s-3
d composite band is ________.
Question 2
Tin exists in two forms: gray tin and white tin. The electrical conductivity of gray tin increases with an increase in temperature, whereas the electrical conductivity of white tin decreases with an increase in temperature. The form of tin that is a semiconductor is ________ tin.