(02.02 lc)\n______ is a nonmetal in the periodic table.\n a mercury\n b potassium\n c sulfur\n d…

(02.02 lc)\n______ is a nonmetal in the periodic table.\n a mercury\n b potassium\n c sulfur\n d yttrium\npregunta 7 (5 puntos)\n(02.02 lc)\na neutral sodium atom has ______ electrons.\n a 9\n b 8\n c 10\n d 11\npregunta 8 (5 puntos)\n(02.02 mc)\nwhich of the following groups of elements are likely to have substances that have both metallic and non - metallic properties\n a actinides\n b group 18\n c lanthanides\n d group 14

(02.02 lc)\n______ is a nonmetal in the periodic table.\n a mercury\n b potassium\n c sulfur\n d yttrium\npregunta 7 (5 puntos)\n(02.02 lc)\na neutral sodium atom has ______ electrons.\n a 9\n b 8\n c 10\n d 11\npregunta 8 (5 puntos)\n(02.02 mc)\nwhich of the following groups of elements are likely to have substances that have both metallic and non - metallic properties\n a actinides\n b group 18\n c lanthanides\n d group 14

Answer

Brief Explanations:

  1. Mercury is a metal and the only metal that is liquid at room - temperature. Potassium is an alkali metal. Yttrium is a transition metal. Sulfur is a non - metal, which is brittle, non - malleable, and a poor conductor of heat and electricity.
  2. The atomic number of sodium is 11. In a neutral atom, the number of electrons is equal to the number of protons (which is the atomic number). So a neutral sodium atom has 11 electrons.
  3. Group 14 elements have some elements with metallic and non - metallic properties. For example, carbon is a non - metal, silicon and germanium are metalloids (have both metallic and non - metallic properties), and tin and lead are metals. Actinides and Lanthanides are mostly metals. Group 18 elements are noble gases, which are non - metals.

Answer:

  1. c. Sulfur
  2. d. 11
  3. d. Group 14