Atoms, Molecules, Compounds

Question 1 of 10 Group 7A elements are also called: A. halogens. B. alkaline earth metals. C. alkali metals. D. noble gases. E. none of the above

Question 2 of 10 An atom containing 7 protons, 8 neutrons, and 7 electrons A. is charge-neutral. B. is an oxygen atom. C. is an ion. D. cannot exist. E. none of the above

Question 3 of 10 What is the charge on the ion formed by aluminum? A. 13+ B. 3+ C. 3- D. 5- E. none of the above

Question 4 of 10 The names of the elements whose symbols are Si, P, Mn, and S are respectively, A. silicon, phosphorus, manganese, and sulfur. B. silicon, potassium, magnesium, and sulfur. C. silicon, phosphorus, magnesium, and sulfur. D. silicon, potassium, magnesium, and sodium. E. silver, phosphorus, magnesium, and sulfur.

Question 5 of 10 How many neutrons are present in Ne-22? A. 10 B. 22 C. 32 D. 12 E. none of the above

Question 6 of 10 Which statement below accurately describes the contributions of Dalton? A. created the modern periodic table B. discovered the existence of electrons C. ancient Greek philosopher who proposed that matter was continuous D. proposed the modern Atomic Theory E. none of the above

Question 7 of 10 Which of the following is a molecular compound? A. nitrogen monoxide B. calcium acetate C. barium sulfide D. potassium hydroxide E. none of the above

Question 8 of 10 How many oxygen atoms are in the formula Al2(CO3)3? A. 1 B. 9 C. 6 D. 3 E. none of the above

Question 9 of 10 Choose the pair of names and formulas that do NOT match. A. copper(II) nitride: Cu3N2 B. copper(II) nitrite: Cu(NO2)2 C. copper(I) nitrate: CuNO3 D. copper(II) nitrate: Cu(NO3)2 E. all of these are correct

Question 10 of 10 What is the formula mass for potassium nitrate? A. 85.11 amu B. 92.99 amu C. 117.11 amu D. 101.10 amu E. none of the above