Within Period 2 of the Periodic Table, what happens as the atomic number increases?
a) The number of electrons within the atom decreases.
b)The atomic mass decreases.
c)The atomic radius increases.
d)The volume of the atom decreases.

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explanation:

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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.