Which hypothesis of Thomson's atomic model was later found to be not true by Niels Bohr and why

At 35.0°c and 3.00 atm pressure, a gas has a volume of 1.40 l. what pressure does the gas have at 0.00°c and a volume of 0.950 l? which equation should you use? p2= p1v1t2/t1v2what is the pressure of the gas? 3.92 atm these are the answers

Which element below could be an isotope of berylliumsodium-10beryllium-10boron -9carbon-9

It's due tomorrow and i can't figure this out