CHM 100 CHEMISTRY MAN & ENVIRONMENT Atoms and Elements Sample Test

Transcription

1 CHM 100 CHEMISTRY MAN & ENVIRONMENT Atoms and Elements Sample Test Multiple Choice: Identify the choice that best completes the statement or answers the question. 1. Which of these elements has two valence electrons? a. Mg b. Li c. Al d. S e. Cl 2. Which of these is a nonmetal? a. Mg c. Cu d. Ge e. Li 3. Calculate the number of moles in a 25 g sample of carbon. a moles b moles c. 300 moles d moles e moles 4. Metals tend to form ions with a positive charge. The most likely way to form a positively charged ion from an atom is by doing which of the following? a. gaining electron(s) b. gaining proton(s) c. losing electron(s) d. losing proton(s) e. losing neutron(s) 5. Which of these elements is a metal? a. Mg d. Ge e. B 6. The number of protons in a neutral atom is equal to the of the atom. a. mass b. atomic weight c. atomic number d. mass number e. valence electron number

2 7. Which of these elements is a metalloid? a. Ge d. Ca e. Fe 8. An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass of amu. The other has an abundance of 62.6% and a mass of amu. What is the atomic weight of the element? a amu b amu c amu d amu e amu 9. What is the charge on an ion that contains 16 protons and 18 electrons? a. 0 b. +2 c. 2 d. It depends on the number of neutrons. e. None of these. 10. Determine the correct number of protons and electrons in Mg 2+? a. 2 protons, 0 electrons b. 12 protons, 10 electrons c. 12 protons, 14 electrons d. 24 protons, 26 electrons e. 24 protons, 22 electrons 11. Determine the correct number of protons and electrons in P 3? a. 3 protons, 6 electrons b. 15 protons, 18 electrons c. 15 protons, 12 electrons d. 31 protons, 28 electrons e. 31 protons, 34 electrons 12. Which of these is the correct chemical symbol for potassium? a. K b. Po c. P d. Pd e. Pt 13. What is the correct number of atoms in one mole of aluminum? a. 12 b c d. 13 e. 14

3 14. Which of these elements is not a chalcogen? a. Cu b. Se c. O d. S e. Te 15. Isotopes of an element have the same number of but a different number of. a. neutrons, protons b. electrons, protons c. protons, neutrons d. neutrons, electrons e. protons, electrons 16. Determine the mass of one mole of silver. a amu b g c. 47 amu d. 47 g e amu 17. Which of these statements about atoms is incorrect? a. Atoms are the smallest visible amount of an element. b. Atoms are composed of protons, neutrons, and electrons. c. Atoms are the building blocks of all matter. d. Atoms are the smallest identifiable unit of an element. e. There are 90 different naturally occurring atoms. 18. Which of these is the correct chemical symbol for carbon? a. C b. Ca c. Cl d. Cb e. Co 19. Which of these particles has a negative charge? a. proton b. neutron c. electron d. nucleus e. an atom 20. Mendeleev organized the elements of the periodic table: a. by increasing atomic number and similar properties. b. by increasing atomic weight and similar properties. c. by increasing number of electrons. d. by increasing number of isotopes. e. alphabetically.

4 21. How many protons (p), neutrons (n), and electrons (e) are in an atom of 235 U? a. 92 p, 146 n, 92 e b. 92 p, 143 n, 92 e c. 92 p, 92 n, 146 e d. 92 p, 92 n, 92 e e. 92 p, 51 n, 92 e 22. Carbon has three isotopes: 12 C, 13 C, and 14 C. These isotopes each have protons, electrons and,, and neutrons respectively. a. 6, 6 and 6, 7, 8 b. 12, 12, and 6, 7, 8 c. 12, 12, and 12, 13, 14 d. 6, 6 and 12, 13, 14 e. 12, 12, and 24, 25, Bromine is a member of what group/family? a. halogen b. noble gas c. alkali metal d. transition metal e. alkaline earth metals 24. What is the maximum number of electrons which can occupy the orbit n = 3? a. 2 b. 6 c. 8 d. 10 e Elements in the same group have the same. a. mass number b. atomic number c. number of protons d. number of electrons e. number of valence electrons Other 26. Which element is in the same group as C? a. B b. Ge c. Al d. P e. U 27. The ground state electron configuration for sodium is a. 1s 2 2s 2 2p 6 3s 2 3p 4 b. 1s 2 2s 2 2p 6 3s 1 c. 1s 2 2s 2 2p 8 d. 1s 2 2s 2 2p 6 3s 2 3p 6 e. 1s 2 2s 2 2p 6 3s 2 3p 4 4s 1

5 28. Bromine has valence electrons a. three b. five c. seven d. eight e. one 29. What is the maximum number of electrons that can occupy a single p orbital? a. 1 b. 2 c. 6 d. 10 e A d sublevel can hold a maximum of a. 2 electrons b. 6 electrons c. 10 electrons d. 14 electrons e. None of the above 31. How many electrons are there in a sulfur atom? a. 16 b. 38 c. 47 d. 79 e Which element is a nonmetal? a. Ca c. Fe d. Ag e. K 33. The charge on the nucleus of a sodium atom is a. 0 b. 1+ c. 11+ d. 23+ e. none of the above 34. Carbon has valence electrons a. three b. five c. seven d. four e. one 35. All noble gases have valence electrons a. three b. five c. seven d. eight e. one

6 36. Which element is an alkaline earth metal? a. B b. Ge d. K e. Ca 37. Which element is a noble gas? a. B b. Ge d. K e. Ca 38. Which element is a metal? a. Ca c. I d. Si e. He 39. The element with the ground state electron configuration of 1s 2 2s 2 2p 6 3s 2 3p 5 is a. F b. Cl d. Br e. Ba 40. How many neutrons are in a potassium 40 isotope? a. 59 b. 40 c. 21 d. 19 e. none of the above