The diagram below shows the structure of an certain atom. Charged particle Charged particle Neutral particle. which statement below is true about the element represented by this diagram?

A. this is element is found in period 4 and group 2(A)

B. this element is found in period 2 and group 2 (A)

C. the element is found in period 9 and group 4(A)

D. th3 identity of this element can not be found by analyzing the diagram.

the ratio of the conjugate base to the acid required to attain the desired ph.

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.