1 An element with an atomic number less than that of magnesium has properties of both a metal and a non-metal. What is that element? (110.0K)A) silicon B) phosphorus C) beryllium D) boron 2 In terms of atomic radius, which is the largest atom? (109.0K)A) lead B) antimony C) selenium D) chlorine 3 The iron triad, iron, cobalt, and nickel ar all __________. (73.0K)A) non-metals B) naturally magnetic C) extremely rare on Earth D) poor conductors. 4 In general, atomic size __________ from left to right across a period.A) decreases B) remains the same C) increases D) increases, then decreases 5 Among the ions F- , Li+ , Cs+ , and At- , which would you expect to have the smallest ionic radius?A) Li+ B) Cs+ C) F- D) At- 6 This alkali-metal compound is used in drain cleaners and in the digestion of wood pulp.A) sodium hydroxide B) sodium carbonate C) sodium chloride D) sodium nitrate 7 Metallic sodium is obtained from NaCl through __________.A) condensation B) electrolysis C) freezing D) thermal decomposition 8 A radioactive isotope of this alkaline-earth metal with a mass number of 90 can replace calcium in the hydroxyapatite of bones.A) barium B) beryllium C) magnesium D) strontium 9 This Group 14 element is used in making ceramics, glass, and cement.A) carbon B) lead C) silicon D) tin 10 Ozone is an allotrope of this element.A) oxygen B) lead C) osmium D) neon 11 This halogen is absorbed readily by the thyroid gland.A) bromine B) chlorine C) fluorine D) iodine 12 Many towns and cities add these compounds to their water supplies.A) carbides B) fluorides C) hydrides D) sulfides 13 This noble gas is used to carry scientific instruments into the upper atmosphere.A) argon B) helium C) krypton D) xenon 14 This nonmetal is used to increase the hardness of steel.A) carbon B) nitrogen C) oxygen D) chlorine 15 Atoms that transfer electrons form __________ bonds.A) ionic B) covalent C) hydrogen D) coordinate