Teoria y Estructura Atómica The Periodic Table of Elements V: Periodicity por Katie Grace Carpenter, M.S. Lectura Prueba Enseñe con esto 1. The work by Frederick McKay in the early 1900s led to which of the following achievements in public health? The introduction of water fluoridation programs The development of water treatment facilities The regulation of school cafeterias to ensure safe and healthy food for all students The recognition of tobacco use as a major health hazard 2. Generally, elements occupying the same period tend to have similar chemical properties. true false 3. Which of the following BEST describes the chemical definition of a "metal." An element that tends to gain electrons in chemical reactions. An element that tends to lose electrons in chemical reactions. An element that tends to lose electrons. An element that tends to gain electrons. 4. Based on periodicity trends, would you predict germanium (Ge) or selenium (Se) to have a larger atomic radius? Ge Se Unable to predict from periodicity trends 5. Based on the factors that determine atomic radius, which of the following statements BEST describes the likely impact of neutron number on atomic radius? Higher neutron numbers most likely leads to higher atomic radii for nonmetals, and lower atomic radii for metals. Higher neutron numbers most likely leads to a smaller atomic radius. Higher neutron numbers most likely leads to a larger atomic radius. Neutron number most likely has little to no direct impact on atomic radius . 6. Based on periodicity trends, which of the following elements likely has the highest 1st ionization energy value? Arsenic (Ar) Antimony (Sb) Nitrogen (N) Phosphorus (P) 7. Compared to an element's 1st ionization energy, the 2nd ionization energy is always lower. true false 8. Which of the following scientists is credited with first conceptualizing the idea of electron affinity? Frederick McKay Dimitri Mendeleev John Newland Linus Pauling 9. Which of the following describes electron affinity? The energy change that occurs from adding an electron to an atom. The energy that is gained from adding an electron to an atom. The energy change that comes from removing an electron from an atom. The energy that is lost by removing an electron from an atom. 10. Metallic character tends to ______ from left to right across the periodic table, and ______ from top to bottom. decrease, decrease decrease, increase increase, increase increase, decrease Resultados de Prueba
