I need the answers for questions 1-7.
1. The protons in a nucleus stay together due to the A) electromagnetic force B) strong nuclear force C) gravitational force D) weak force 2. A certain radioactive isotope decays to one fourth of its original amount in 8.0 hours. What is its half life? A) 4.0 hours B) 2.0 hours C) 2.5 hours D) 3.4 hours 3. Isotopes of an element have A) the same number of protons, but a different number of neutrons. B) the same number of electrons, but a different number of protons. C) the same number of neutrons, but a different number of protons. 4. What is the number of oxygen atoms in Al2(CO3)3? A) 3 B) 2 C) 6 D 9 5. Because of the law of conservation of mass A) the mass of a newly formed compound cannot be changed. B) molecules cannot be broken down, for the mass would be reduced. C) the number of atoms of reactants must equal the number of atoms of products. 6. It is possible for a hydrogen atom to emit an alpha particle. A) true B) false 7. Isotope A has a half-life of ten years and isotope B has a half-life of five seconds. Which is more radioactive? A) isotope A B) isotope B C) Both are equally dangerous.
1. B strong nuclear force
2. A. 4hours
3. A same number of proton different number of neutrons
4. D. 9