Week 10 1. Noble gases are nonmetallic elements that do not readily react with other elements. What accounts for this non-reactivity? Noble gases have 6 valence electrons Noble gases have 8 valence electrons Noble gases have 10 valence electrons Noble gases have 2 valence electrons 2. When a potassium atom (K) forms a potassium ion (K+), the atom Gains a proton Gains an electron Loses a proton Loses an electron

3. Which of the following are Alkali Metals Magnesium Calcium Potassium Lithium Strontium Beryllium and Lithium Lithium and Potassium Magnesium, Calcium, and Strontium Lithium, Calcium, and Strontium 4. In what section of the periodic table can metalloids be found? In the transition metals In the alkali metals Diagonally across the right side of the periodic table Only in the boron family of the periodic table

5. The following table shows the abundance and half-life of 4 of the 15 known carbon isotopes. Which is the MOST common stable isotope of carbon? Isotope Natural abundance Half-Life 8C ~0% 1.99 x 10 -21 s 12C 98.89% Infinite 13C 1.11% 14C 1 x 10 -10 % 5,730 years 8C c. 13C 12C d. 14C 6. Which of the following radioactive emissions is the largest in size? Alpha particle c. Gamma ray Beta particle d. X-Ray

Beta particles c. Gamma radiation Alpha particles d. Radio nucleus 7. A scientist detected radiation escaping from a material encased in a thick block of concrete. Identify the type of radiation the scientist MOST likely detected. Beta particles c. Gamma radiation Alpha particles d. Radio nucleus 8. Alpha decay produces a new nucleus whose __________ than those respectively of the original nucleus. A) atomic number is 2 more and mass number is 4 more B) atomic number is 2 less and mass number is 2 less C) atomic number is 1 less and mass number is 2 less D) atomic number is 2 less and mass number is 4 less

9. When an isotope releases gamma radiation the atomic number A)decreases by two and the mass number decreases by four. B)increases by one and the mass number remains the same. C)and the mass number decrease by one. D)and the mass number remain the same. 10. Neodymium 144Nd is a nuclide that undergoes alpha decay. The nuclide that is the product of the decay is: 14862Sm B) 14256Ba C) 14059Pr D) 14058Ce