One characteristic of scientific theory is
a.) it can be proved
b.) it cannot be modified
c.) it can never be proved
d.) it summarizes a set of observations

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.