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1. Species with same number of neutrons but different number of protons are called: a) Isotones b) Isotopes c) Isomers d) Isobars 2. Atomic number of a species is the number of: a) Neutrons b) Protons c) Valence electrons d) Nucleons 3. Oxygen gas is denser than Carbon Dioxide gas? a) True b) False 4….

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