All atoms of an element have the same Select one: a. mass number b. atomic number c. number of isotopes d. number of neutrons Which particle is the least massive? Select one: a. proton b. electron c. nucleus d. neturon An electron is a particle with Select one: a. a negative charge, found in the nucleus. b. a positive charge, found in the nucleus. c. no charge, found outside the nucleus. d. a negative charge, found outside the nucleus. The number of neutrons in an atom equals the Select one: a. mass number minus atomic number. b. atomic number plus number of electrons. c. mass number plus atomic number. d. atomic number minus mass number. The atomic number of sulfur is 16. How many electrons are there in an atom of sulfur-34? Select one: a. 16 b. 34 c. 18 d. 50 What is the maximum number of electrons that can occupy the second energy level of an atom? Select one: a. 2 b. 8 c. 18 d. 32 Almost all the mass of an atom is located in its Select one: a. protons b. electrons c. electron cloud d. nucleus What is the mass number of oxygen-18? Select one: a. 8 b. 10 c. 16 d. 18 Which of the following is NOT true of electrons? Select one: a. electrons have a negative charge b. are found in energy levels outside the nucleus c. are only found in two energy levels d. have no mass Elements that have the same number of valence electrons are Select one: a. in the same period. b. in the same group. c. called noble gases. d. called transition metals. Copper is an example of Select one: a. an alkali metal. b. an alkaline earth metal. c. a nonmetal. d. a transition metal. How many periods does the periodic table have? Select one: a. 18 b. 7 c. 9 d. 8 Which group of the periodic table contains atoms with a stable outer electron configuration? Select one: a. 1 b. 2 c. 16 d. 18 An element that is shiny and conducts electric current is likely to be a Select one: a. gas. b. metal. c. metalloid. d. nonmetal. An element that is shiny and conducts electric current is likely to be a Select one: a. gas. b. metal. c. metalloid. d. nonmetal. How many valence electrons do atoms of oxygen and sulfur have? Select one: a. 2 b. 4 c. 8 d. 6 Which element would have the same number of valence electrons as fluorine? Select one: a. sulfur b. calcium c. bromine d. sodium Dot diagrams are used to represent _____. Select one: a. outer electons. b. the structure of the nucleus. c. isotopes. d. atomic number. Which statement best describes nonmetals? Select one: a. Nonmetals are good conductors of heat and electric current. b. Nonmetals are brittle solids. c. Nonmetals have properties opposite to those of metals. d. Nonmetals are located on the left side of the periodic table. Which list of elements contains only metalloids (semi-metals)? Select one: a. aluminum and gallium b. silicon and germanium c. phosphorus and arsenic d. gallium, germanium, and arsenic If an atom has an atomic number of 6 and a mass number of 14, how many electrons are in the atom? Select one: a. 8 b. 2 c. 4 d. 6