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MA High School Chemistry Module 1 atomic structure and the periodic table overview quiz quiz

12questions. Pick an answer and you'll see why right away.

  1. What does the atomic number of an element tell you?

  2. An atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?

  3. What is true of two isotopes of the same element?

  4. How many valence electrons does an atom with the electron arrangement 2, 8, 6 have?

  5. According to the octet rule, what does a magnesium atom (2, 8, 2) tend to do?

  6. How does atomic radius change as you move left to right across a period?

  7. Why do elements in the same group have similar chemical properties?

  8. Which element has the highest electronegativity?

  9. How many particles are in one mole of a substance?

  10. An element has two isotopes: mass 10 amu (20%) and mass 11 amu (80%). What is its average atomic mass?

  11. In alpha decay, how do the mass number and atomic number of the nucleus change?

  12. A radioactive sample of 80 g has a half-life of 8 days. How much remains after 24 days?