To run a thin layer chromatography experiment with a chemical substance, begin by marking a horizontal line near the bottom of a TLC plate with . Place a spot of the substance onto the line. For the mobile phase, add a small amount of at the bottom of a TLC chamber. Place the plate in, then the chamber. Once the mobile phase approaches the top of the plate, remove the plate and mark the line. Note the position of the spots and calculate Rf values if needed. A. Options for blank 1: pen, pencil
B. Option for blank 2: large, small
C. Options for blank 3: solvent, solid
D. Options for blank 4: cover, shake
E. Options for blank 5: starting, solvent

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.