15. For an electron that has quantum number n=3 and m_(1)=+1 ,which of the following is true? A. It may have quantum number t=1,2 B. It has only quantum number c C. It may have quantum number t=0,1,2 D. It has only quantum number x=1 16. Rutherford's a-particle experiment showed that A. Electrons revolve around the nucleus B. Neutron is found in the nucleus C. Most of the mass of an atom is concentrated in a nucleus D. All of the above 17. Atoms of the elements to the left hand side of the periodic table have: A. the highest ionization energy B. the smallestatomic radius C. the smallest electronegativity D. the highest valance electron D 18. Which of the following is not true? A. Alpha particles are deflected toward the negative plate B. Gamma rays are highly energetic electromagnetic radiation C. Beta particles are electrons which are emilted from the nucleus difit D. Radioactivity is the emission of light by unstable nuclei .A.jmcemilion antith) b

Question

15. For an electron that has quantum number n=3 and m_(1)=+1 ,which of the following is true? A. It may have quantum number t=1,2 B. It has only quantum number c C. It may have quantum number t=0,1,2 D. It has only quantum number x=1 16. Rutherford's a-particle experiment showed that A. Electrons revolve around the nucleus B. Neutron is found in the nucleus C. Most of the mass of an atom is concentrated in a nucleus D. All of the above 17. Atoms of the elements to the left hand side of the periodic table have: A. the highest ionization energy B. the smallestatomic radius C. the smallest electronegativity D. the highest valance electron D 18. Which of the following is not true? A. Alpha particles are deflected toward the negative plate B. Gamma rays are highly energetic electromagnetic radiation C. Beta particles are electrons which are emilted from the nucleus difit D. Radioactivity is the emission of light by unstable nuclei .A.jmcemilion antith) b

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Answer

15. **A. It may have quantum number *l* = 1, 2** The principal quantum number *n* = 3 means the electron is in the third energy level. The magnetic quantum number *ml* can have integer values ranging from -*l* to +*l*. Since *ml* = +1, the azimuthal quantum number *l* must be at least 1. For *n* = 3, *l* can be 0, 1, or 2. Since *ml* is +1, *l* cannot be 0. Therefore, *l* can be 1 or 2. 16. **C. Most of the mass of an atom is concentrated in a nucleus** Rutherford's gold foil experiment demonstrated that most alpha particles passed straight through the gold foil, but a small number were deflected at large angles. This indicated that the atom's positive charge and most of its mass were concentrated in a small, dense central region (the nucleus), while the rest of the atom was mostly empty space. 17. **C. the smallest electronegativity** Elements on the left side of the periodic table are alkali and alkaline earth metals. These elements have low electronegativity because they readily lose electrons to achieve a stable electron configuration. Electronegativity increases across a period (from left to right) and decreases down a group. 18. **D. Radioactivity is the emission of light by unstable nuclei.** Radioactivity is the spontaneous emission of particles or energy from unstable atomic nuclei. While some radioactive decay processes can involve the emission of photons (gamma rays), which are a form of electromagnetic radiation, radioactivity is not simply the emission of light. It encompasses alpha, beta, and gamma emissions. Alpha particles are helium nuclei, beta particles are electrons or positrons, and gamma rays are high-energy photons.

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