Sodium (located in the third period of the periodic table) has a principle quantum
number (n) of

3

Explanation: For example, sodium is in the third period of the table, so its principal quantum number is 3. Denote the principal quantum number as n and the second number, shape, is anywhere from 0 to n-1. So for sodium, the second quantum numbers are 0,1 and 2.

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

catya that's not even a b or c