Regular Chemistry - Atoms & Elements Practice Test

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1 Regular Chemistry - Atoms & Elements Practice Test Mr. Matthew Totaro MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following statements about atoms is FALSE? A) Atoms compose all matter. B) An atom is the smallest identifiable unit of an element. C) Atoms are the basic building block of nature. D) Atoms are responsible for the sensation of smell. E) All of the above statements are true. 2) Which statement below accurately describes the contributions of Dalton? A) proposed the modern Atomic Theory B) ancient Greek philosopher who proposed that matter was continuous C) created the modern periodic table D) discovered the existence of electrons E) none of the above 3) Which of the statements about the discovery of electrons is FALSE? A) The negatively charged electron is located outside the nucleus. B) Because atoms are neutral, the existence of a negatively charged particle implied there must be a positively charged component of an atom. C) Thomson proposed that electrons were small particles held within a positively charged sphere. D) Rutherford proved the plum-pudding model correct. E) All of the above statements are true. 4) The Rutherford gold foil experiment demonstrated that atoms A) are visible to the naked eye. B) consist of a dense nucleus surrounded by mostly empty space. C) are homogeneous. D) consist of a single type of subatomic particle. E) consist of an almost empty nucleus surrounded by a dense cloud of electrons. 5) Which of the following pairs of subatomic particles have charges of equal magnitude but opposite in sign? A) proton and electron B) gamma ray and neutron C) neutron and proton D) proton and positron E) electron and neutron 6) The correct symbol for the isotope of potassium with 22 neutrons is. A) K B) K C) K D) P E) P 1

2 7) How many electrons are in Br-? A) 4 B) 34 C) 36 D) 7 E) none of the above 8) Which of the following is NOT true for the atoms 13N, 14N, and 15N? A) They all have 7 protons. B) They all have 7 electrons. C) They are isotopes. D) They all have the same mass number. E) They all have the same atomic number. 9) The number of protons in the nucleus of an atom: A) identifies the atom as a particular element. B) is the same for all isotopes of an element. C) is given the symbol "Z." D) is called the atomic number. E) all of the above 10) What happens to an atom when it absorbs energy? A) The atom re-emits the energy as heat. B) The extra energy increases the speed of the electrons in their orbitals. C) The atom re-emits the energy as light. D) The atom stores the energy for later use. E) none of the above 11) The atomic orbital depicted below would be found in a sublevel. A) 6p B) 2s C) 4f D) 5d E) 3p 12) What is the maximum number of electrons that the f subshell can hold? A) 10 B) 5 C) 14 D) 6 13) The electron configuration of Ga is. A) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 10 4p 1 B) [Ar]4s 2 3d 11 C) 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 1 D) 1s 2 2s 2 3s 2 3p 6 3d 10 4s 2 4p 1 E) 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4d 1 2

3 14) What is the electron configuration for potassium (atomic number 19)? A) 1s 2 2s 2 2p 6 3s 2 3p 5 3d 2 B) 1s 2 2s 2 2p 8 3s 2 3p 5 C) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 D) 1s 2 2s 2 2p 6 3s 2 3p 7 E) 1s 2 2s 2 2p 6 3s 2 3p 5 4s 1 15) What element has the electron configuration 1s 2 2s 2 2p 6 3s 2? A) Na B) Be C) Si D) Mg E) Ca 16) The correct electron configuration for chromium is. A) 1s22s22p63s23p63d 6 B) 1s22s22p63s23p6 C) 1s 2 2s 2 2p 6 3s 2 3p 6 3d44s2 D) 1s22s22p63s23p64s23d104p1 E) 1s22s22p63s2 17) Which of the following electron configurations is incorrect as written? A) 1s 2 2s 2 2p 6 3s 2 3p 6 B) 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 C) 1s 2 2s 2 2p 6 3s 2 D) 1s 2 2s 2 2p6 E) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 3

4 18) Which orbital diagram represents a violation of the Pauli exclusion principle? A) B) C) D) E) 19) Which of the following denotes an orbital diagram for a boron atom? A) B) C) D) E) 4

5 TRUE/FALSE. Mark 'A' if the statement is true and 'B' if the statement is false. 20) The atom is the fundamental building block of everything we hear, feel, see, and experience. 21) John Dalton was the first person recorded as thinking that matter was ultimately composed of atoms. 22) You can continually divide matter into smaller and smaller pieces without ever coming to an end. 23) The plum pudding model proposed that negatively charged electrons were held in a sphere of positive charge. 24) J.J. Thomson discovered the existence of protons. 25) Protons and electrons each have a mass of 1 amu. 5

6 Answer Key Testname: REGULAR CHEMISTRY - ATOMS & ELEMENTS PRACTICE EXAM 1) E 2) A 3) D 4) B 5) A 6) B 7) C 8) D 9) E 10) C 11) D 12) C 13) C 14) C 15) D 16) C 17) B 18) A 19) E 20) TRUE 21) FALSE 22) FALSE 23) TRUE 24) FALSE 25) FALSE 6

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