Could i get some help, thank you !!

Question 1 Consider the following atoms: 160, 180, 18F, and 18Ne. Which have the same number of neutrons? O 160 and 18Ne O 160, 18F, and 18 Ne O 160 and 180 O 18F and 160 Question 2 A nuclei has a mass of 8.95x10-27 kg. What is its mass in Mev/c2? O 5.02x103 Mev/C2 O 1.08x104 Mev/C2Question 3 Is the following decay possible? 232Th (Z= 90) - 236U (Z = 92) + a It's impossible to tell O No O Yes Question 4 Nucleus A decays into nucleus B with a half-life of 10 s. At t= 0 s, there are 1000 A nuclei and no B nuclei. At what time will there be 750 B nuclei? O 30 s O 14 s O 10 s O 20 s