1) What is Isotopes? a) Atoms with the same number of protons but different numbers of neutrons b) a line connecting points of equal atmospheric pressure c) a molecule with the same chemical formula as another molecule but a different arrangement of atoms 2) What is Hydrogen-1 (Protium) ? a) A radioactive isotope of hydrogen with one proton and two neutrons. b) The most common isotope of hydrogen, with one proton and no neutrons. c) An isotope of hydrogen with one proton and one neutron 3) What is Carbon-12 (C-12) ? a) A stable isotope of carbon with six protons and seven neutrons. b) : A radioactive isotope of carbon with six protons and eight neutrons, used in radiocarbon dating. c) A stable isotope of carbon with six protons and six neutrons. 4) What is Oxygen-16 (O-16) ? a) A stable isotope of oxygen with eight protons and nine neutrons. b) A stable and abundant isotope of oxygen with eight protons and eight neutrons. c) A stable isotope of oxygen with eight protons and ten neutrons. 5) How many Protons & Neutron in Chlorine-35 (³⁵Cl) ? a) Has 17 protons and 18 neutrons. b) Has 18 protons and 17 neutrons. c) Has 19 protons and 18 neutrons.

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