List the two factors that affect ionic bond formation. Describe the trends of one of these factors in the periodic table. PLS HELP FAST

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.

How many moles are in 7.2 x 10^23 carbon molecules?