write a general statement about the valence shell electron configuration of cations which generated colorless solutinons

i think the answer would be b

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

measuring things 1 litre of water

what is the actual question though?