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The Atom/Nuclear

The Atom/Nuclear. Study Guide Review. Complete the following table:. The number of protons in an atom is its atomic number. The number of protons + neutrons in an atom is its Mass number or atomic mass. What are isotopes?

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The Atom/Nuclear

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  1. The Atom/Nuclear Study Guide Review

  2. Complete the following table:

  3. The number of protons in an atom is its atomic number • The number of protons + neutrons in an atom is its Mass number or atomic mass • What are isotopes? Atoms of the same element with different masses; neutrons are different • How does mass number differ from atomic mass? Relatively the same

  4. Use the periodic table to identify the following elements: • (a) 47 protons -- Ag • (b) 95 electrons -- Am • (c) atomic number = 28 -- Ni • (d) 6 protons and 8 neutrons -- C Remember – A=P=E Atomic number = Protons = Electrons

  5. Complete the following table:

  6. Define the following terms: • Radioactivity – atoms with unstable nuclei that emit Alpha (α), Beta (β) or Gamma (γ) particles • Radioisotopes – isotopes of an element that undergo radioactive decay • Half-life – the time it takes for ½ the particles to decay • Nuclear fission – splitting apart of a nucleus • Nuclear fusion – coming together of nuclei (example – surface of the sun)

  7. Nuclear reactions involve changes in an atom’s nucleus, where chemical reactions do not.

  8. Complete the following table:

  9. Write a balanced nuclear equation for each of the following decays • Alpha decay of polonium-218 218 Po → 4 He + 214 Pb 84 282 • Beta decay of potassium-43 43 K → 0 e + 43 Ca 19-120

  10. The half-life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope? • Days = 415.2 days • ½ life = 138.4 days • Start with = 2mg 1 .5 .25 138.4 + 138.4+138.4 = 415.2

  11. The half-life of cobalt-60 is 10.47 min. How many milligrams of cobalt-16 remain after 104.7 min if you start with 10.0 mg? .0097

  12. Radon-222 undergoes the following decay series: • ααββαββα • What element is formed?

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