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- 3. An atom consists of a. one nucleus and only one electron b. one nucleus and one or more electrons c. protons, electrons, and neutrons d. answers (b) and (c)If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element? A.15/7 N B. 8/15 O C. 15/8 O D. 7/8 O E. None of these1.Tell how many protons, electrons and neutrons there are in each of the ff. Atoms:
- 6. The particles in the nucleus that have a positive charge are the b. neutrons a. electrons c. protons d. positrons 7. Elements that are not good conductors of heat or electricity are the b. non-metals a. metals c. metalloids d. solids 8. On the periodic table, the number of electrons is equal to- b. the atomic weight a. the mass number c. the atomic number d. the number of neutrons 9. Electrons are located in the a. Electron cloud b. cumulus cloud c. nucleus cloud d. fog 10. According to Dalton, these can not be created or destroyed. b. heat d. radioactivity a. Matter C. atoms 11. Group 2 on the Periodic Table is also known as the a. Halogens b. Noble Gases c. Alkali metals d. Alkaline earth metals 12. Elements on the right side of the Periodic Table are b. non-metals a. metals c. liquids d. solids 13. Elements from the Periodic Table that are malleable and ductile are called a. metalloids b. gases c. metals d. non-metals 14. Electrons that are located a. closest to the nucleus have…Consider the atomic species: 146C, 126C and 15,N. Which ones have the same number of neutrons? a. None of them b. 126C and 15,N C. All three O d. 146C and 15,N e. 146C and 126CA heavy hydrogen nucleus with one proton and one neutron is called a. bi-hydrogen. b. tritium. c. deuterium. d. lithium. e. helium.
- 2. Lithium has only two naturally occuring isotopes: lithiumi-6 and lithium-7. Lithium-6 has a mass of 6.01512 and makes up 7.42 percent of all naturally occuring lithium. Lithium-7 has a mass of 7.016 and makes up the remaining 92.58 percent. What is the atomic mass of lithium? (Show your calculations) 3. Identify the period and the family of the following a. Oxygen b. Lithium c, Vanadium d. Calcium 4. Identify the number of protons, neutrons, and electrons in the sulfur isotope with atomic number 16 and mass number 321. Which is more stable, A or B? A. B.How does the wave model of electrons orbiting the nucleus account for the fact that the electrons can only have discrete energy values? A. Electrons are only able to vibrate at particular frequencies. B. When an electron wave is confined, it is reinforced at only particular frequencies. C. The energy values of an electron only occur where its wave properties and probability clouds are mutually reinforcing. D. The wave model accounts for the types of orbitals an electron may occupy, not energy levels. E. None of the above
- How many neutrons in the following element? 238 92 Select one: O a. 238 O b. 92 O c. 330 O d. 146Question 17 17. The atomic energy level diagram accounts for A. the emission spectra of an atom B. the absorption spectra of an atom C. both A and B D. none of the above D. OC O B36. The half-life of element X is 8 days. If 120 g of element X is placed on a table, how much remains after 24 days? A. 10 g B. 24 g C. 30 g D. 15 g E. 5 g