The model below shows an atom of an element. What is the atomic number of this atom? O 6
O 8
09
O 16

The atomic number of the atom represent by the model is

8 (answer B)

Explanation:

The atomic number  of atom is 8 because the  model below has a total  number of 8 electrons.

that is: 2 electrons in the inner energy level and 6 electrons in the outermost energy level which make a total of 2+6= 8 electrons

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.