1. How is the electron configuration of an element determined? How do you know how
many valence electrons an element has? (You may use nitrogen as an example
element if it helps you explain.)

output?

explanation:

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.

im doing test rn im going with 2 but ill give answer if itss wrong,   : )