Some elements are more reactive than other elements why do you think this is

Different elements all have different amounts of electrons in there outter shell.

Explanation

If you look at a periodic table, the elements are all listed in "Groups" up at the top you'll see the numbers, or columns. Each column's number represent how many electrons there are in each particular element.

hope this makes sense

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.