An amoeba has 1.00 x10^6 protons and a net charge of 0.300 pc. how many fewer electrons are there than protons

1 pico anything = 1 * 10^-12 
0.300 pico coulombs = 0.300 * 10^-12 coulombs = 3.00 * 10^-13 coulombs.

1 proton has a charge of 1.60 * 10^-19 c
1*10^6 protons have a charge of 1.6 * 10^-19 * 1*10^6
Gross Charge of protons = 1.6 * 10^-13 c

That's what the charge should be if only protons were present.
However there are electrons around and when they are taken into consideration, the charge drops to 3.00 * 10^-13

So the difference allows us to calculate the number of electrons. The way the question is worded, this is impossible. Sorry.

Did you ever figue this

Sorry my friend i don't know the answer. i am just in 6th