What is the arrow pointing to?
the figure shows a solution of different molecules. some of them consist of two small atoms attached to a bigger one. some are negatively charged, and consist of one big atom attached to the small one. there are also small positively charged atoms, which are pointed by an arrow.
a. hydrogen ion
b. hydronium ion
c. electron
d. hydroxide ion
e. water molecule

Option A

Explanation:

Hi, this is why A is the correct option:

Hydronium ion ( ), water ( ) and hydroxide ion () are all molecules formed by two or more atoms.

So the correct answer is between hydrogen ion and electron. Well the diference is that the first one is positively charged (as the atom pointed) and the second one is negatively charged.

By elimination of the other options, the right one is option A

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

a corroding iron, if that's one of your choices