Can someone please help will Mark brainley

The conventional equilibrium constant expression (kc) for the system below is: 2icl(s) ⇄ i2(s) + cl2(g) [cl2] ([i2] + [cl2])/2[icl] [i2][cl2]/[icl]2 none of the listed answers are correct [i2][cl2]/2[icl]

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory