Name: ate:. ll of the atoms of argon have the same 6. The nucleus is the part of the atom that. mass number. atomic number. number of neutrons. number of nucleons. consist mostly of empty space. has a negative charge. occupies most of the atom s total volume. contains most of the atom s total mass 2. Which is the atomic number of an atom with six valence electrons? 7. What is the mass number of an ion that has 83 protons, 80 electrons, and 26 neutrons?. 6. 8. 0. 2. 83. 206. 209. 289 3. Which of the following atoms has the greatest nuclear charge?. 4 7 N. 2 6. 2 H. 4 2 He 4. What can be determined if only the atomic number of an atom is known?. the total number of neutrons in the atom, only. the total number of protons in the atom, only. the total number of protons and the total number of neutrons in the atom. the total number of protons and the total number of electrons in the atom 5. Which two particles have approximately the same mass?. neutron and electron. neutron an deutron. proton and neutron. proton and electron 8. The nucleus of an atom of 27 53 I contains. 53 neutrons and 27 protons. 53 protons and 27 neutrons. 53 protons and 74 neutrons. 53 protons and 74 electrons 9. The atomic mass of an element is defined as the weighted average mass of that element s. most abundant isotope. least abundant isotope. naturally occurring isotopes. radioactive isotopes 0. In which list are the elements arranged in order of increasing atomic mass?. l, K, r. Fe, o, Ni. Te, I, Xe. Ne, F, Na page
. ase your answer(s) to the following question(s) on the data table below, which shows three isotopes of neon. Isotope tomic Mass (atomic mass units) Percent Natural bundance 20Ne 9.99 90.9% 2Ne 20.99 0.3% 22Ne 2.99 8.8% In terms of atomic particles, state one difference between these three isotopes of neon. 2. Which isotopic notation represents an atom of carbon-4?. 6 8. 8 6. 6 4. 4 6 3. The atoms in a sample of an element must contain nuclei with the same number of. electrons. protons. neutrons. nucleons 4. In an experiment, alpha particles were used to bombard gold foil. s a result of this experiment, the conclusion was made that the nucleus of an atom is. smaller than the atom and positively charged. smaller than the atom and negatively charged. larger than the atom and positively charged. larger than the atom and negatively charged 5. Which kind of particle, when passed through an electric field, would be attracted to the negative electrode?. an alpha particle. a beta particle. a neutron. an electron 6. fter bombarding a gold foil sheet with alpha particles, scientists concluded that atoms consist mainly of. electrons. empty space 7. What is the total charge of the nucleus of a carbon atom?. 6. 0. +6. +2 8. proton has a charge that is opposite the charge of. an alpha particle. a neutron. an electron. a positron 9. The table below gives information about the nucleus of each of four atoms. tom Nuclei of Four toms Number of Protons Number of Neutrons 6 6 6 7 E 7 7 G 7 8 How many different elements are represented by the nuclei in the table?.. 2. 3. 4 20. Which nucleus contains the greatest number of neutrons?. 3 6 S. 32 6 S. 3 5 P. 32 5 P 2. Which particle can not be accelerated by the electric or magnetic fields in a particle accelerator?. neutron. proton. alpha particle. beta particle 22. In which pair of atoms do both nuclei contain the same number of neutrons?. 7 3 Li and 9 4 e. 40 40 K and 9 7 l 40 38. a and 20 8 r. 4 7 N and 6 8 O. protons. neutrons page 2
23. Which nucleus is from an isotope of an atom with 6n the nucleus 6p? 29. Usually the term kernel includes all parts of the atom except the. 6n 6p. 4n 8p. neutrons. protons. valence electrons. orbital electrons. 8n 6p. 6n 8p 30. a 2+ ion differs from a a 0 atom in that the a 2+ ion has 24. Neutral atoms of the same element can differ in their number of. neutrons. positrons. protons. electrons 25. ase your answer(s) to the following question(s) on the information below. Isotope Notation Naturally Occurring Isotopes of opper Percent Natural bundance (%) tomic Mass (atomic mass units, u) u-63 69.7 62.930 u-65 30.83 64.928 State, in terms of subatomic particles, how an atom of u-63 differs from an atom of u-65. 26. The maximum number of electrons that may be found in the third principal energy level is. 8. 2. 8. 32 27. Which particle has a mass that is approximately of the mass of a proton?,836. a gamma ray. a neutron. an alpha particle. an electron 28. What is the total number of valence electrons in an atom of phosphorus in the ground state?. more protons. fewer protons. more electrons. fewer electrons 3. When the electrons of an excited atom fall back to lower levels, there is an emission of energy that produces. beta particles. alpha particles. spectral lines. gamma radiation 32. What is the approximate mass of an electron?. atomic mass unit. 2 of a -2 atom. 836 of a proton. 835 836 of a proton 33. What is the total number of electrons in an atom of 9 9 F?. 9. 0. 9. 28 34. What is the most probable location of an electron?. an orbital. a nucleus. a sublevel. a principal energy level. 5. 2. 3. 7 page 3
35. In the wave-mechanical model, an orbital is a region of space in an atom where there is 40. Which principal energy level of an atom contains an electron with the lowest energy?. a high probability of finding an electron. a high probability of finding a neutron. a circular path in which electrons are found. a circular path in which neutrons are found 36. How many electrons are in an Fe 2+ ion?. 24. 26. 28. 56 37. ase your answer(s) to the following question(s) on the diagram below, which represents an atom of magnesium-26 in the ground state.. n =. n = 2. n = 3. n = 4 4. n electron in a sodium atom moves from the third shell to the fourth shell. This change is a result of the atom. absorbing energy. releasing energy. gaining an electron. losing an electron 42. What is the net charge of an ion that consists of 0 electrons, protons, and 2 neutrons?. +. 2 +.. 2 43. How do the chemical properties of the Na atom and the Na + ion compare?. They are the same because each has the same atomic number.. They are the same because each has the same electron configuration. What is the total number of valence electrons in an atom of Mg-26 in the ground state? 38. What is the maximum number of electrons that can occupy the second principal energy level?. 6. 8. 8. 32 39. The characteristic bright-line spectrum of an element is produced when electrons. are given off as beta particles. are gained from another atom. move to higher energy levels. fall back to lower energy levels. They are different because each has a different atomic number.. They are different because each has a different electron configuration. 44. s an atom becomes an ion, its mass number. decreases. increases. remains the same 45. Which element has an atom with the electron configuration 2 8 8 2?. Mg. Ni. a. Ge 46. What is the electron configuration of a sulfur atom in the ground state?. 2 4. 2 6. 2 8 4. 2 8 6 page 4
47. Which is the electron dot symbol of an atom of boron in the ground state? 53. Which statement best explains why most atomic masses on the Periodic Table are decimal numbers?... Ḅ:.... Ḃ:. Ḃ: 48. Which electron-dot symbol correctly represents an atom of its given element?.... 49. In the box provided below, draw the electron-dot (Lewis) structure of an atom of chlorine.. tomic masses are determined relative to an H standard.. tomic masses are determined relative to an O 6 standard.. tomic masses are a weighted average of the naturally occurring isotopes.. tomic masses are an estimated average of the artificially produced isotopes. 54. 00.00-gram sample of naturally occurring boron contains 9.78 grams of boron-0 (atomic mass = 0.0 atomic mass units) and 80.22 grams of boron- (atomic mass =.0 atomic mass units). Which numerical setup can be used to determine the atomic mass of naturally occurring boron? 50. s an electron in an atom falls to a lower energy level, the potential energy of the electron. decreases. increases. remains the same 5. If 75.0% of the isotopes of an element have a mass of 35.0 amu and 25.0% of the isotopes have a mass of 37.0 amu, what is the atomic mass of the element?. (0.978)(0.0) + (0.8022)(.0). (0.8022)(0.0) + (0.978)(.0).. (0.978)(0.0) (0.8022)(.0) (0.8022)(0.0) (0.978)(.0) 55. The diagram below represents the bright-line spectra of four elements and a bright-line spectrum produced by a mixture of three of these elements.. 35.0 amu. 35.5 amu. 36.0 amu. 37.0 amu 52. Hydrogen has three isotopes with mass numbers of, 2, and 3 and has an average atomic mass of.00794 amu. This information indicates that. equal numbers of each isotope are present. more isotopes have an atomic mass of 2 or 3 than of Which element is not present in the mixture?... X. Z. more isotopes have an atomic mass of than of 2 or 3. isotopes have only an atomic mass of page 5
Problem-ttic format version 4.4.229 c 20 205 Educide Software Licensed for use by Nicholas astro Terms of Use at www.problem-attic.com 0/27/205. 2. 3. 4. 5. 6. 7. 8. 9. 0.. 2. 3. 4. 5. 6. 7. 8. 9. Each isotope has a different number of neutrons or different number of neutrons or Ne-22 has two more neutrons than Ne-20 and one more neutron than Ne-2. 20. 2. 22. 23. 24. 25. 26. 27. 28. 29. 30. 3. 32. 33. 34. 35. 36. n atom of copper-63 has two fewer neutrons than an atom of copper-65. n atom of u-63 has 34 neutrons and an atom of u-65 has 36 neutrons. 37. 2 38.
Teacher s Key Page 2 39. 40. 4. 42. 43. 44. 45. 46. 47. 48. 49. 50. 5. 52. 53. 54. 55.