F331 quiz 4.0 / 5 based on 1 rating ? ChemistryASOCR Created by: philCreated on: 21-04-13 19:19 What is the atomic number? The number of protons in the nucleus of an atom 1 of 12 What is the symbol for mass number? A 2 of 12 What is the symbol for atomic number? Z 3 of 12 What is an ion? An atom which has lost or gained electrons 4 of 12 What is an isotope? Atoms of the same element with the same number of protons but a different number of neutrons 5 of 12 Who discovered the electron in 1899? J.J. Thompson 6 of 12 Geiger, Marsden and Rutherford fired what at gold foil? Alpha particles 7 of 12 What did the Geiger, Marsden and Rutherford experiment show? There is mostly empty space in atoms but a tiny positively charged nucleus which can deflect alpha particles. 8 of 12 Who showed the importance of the atomic number? Henry Moseley 9 of 12 What is a radioactive tracer? They are used to find out what happens to an element in the body 10 of 12 Why are short-lived isotopes used as radioactive tracers To minimize damage to the body cells 11 of 12 What is radioactive decay? The spontaneous emission of particles and rays from an unstable nucleus of an atom 12 of 12
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