Could i please get some help with this, thank you !!

Question 1 Consider the following atoms: 160, 180, 18F, and 18Ne. Which are isotopes? O 18F, and 18Ne O 160, 18F, and 18Ne O 180, 18F, and 18Ne O 160 and 180 Question 2 A nuclei has a mass of 7.79x1027 kg. What is its mass in Mev/c2? O 9.39x103 Mev/C2 O 4.69 Mev/c2 O 4.37x103 Mev/C2 Question 3 Is the following decay possible? 232Th (Z= 90) - 236U (Z = 92) + a O It's impossible to tell O No O YesQuestion 4 Nucleus A decays into nucleus B with a half-life of10 3. At I: U 9, there are 1000 A nuclei and no B nuclei. At what time will there be 750 B nuclei? 0305 0203 OMS 0105