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1 Created by Boundless Which of the following statements correctly describes the relative masses of the three subatomic particles? A Neutrons and electrons weigh the same, protons weigh much less. B Protons and neutrons weigh the same, electrons weigh much less. C Protons, neutrons and electrons all weight the same. D Protons and electrons weigh the same, neutrons weigh much less. 2 Created by Boundless Which of the following statements correctly describes the relative charges of the three subatomic particles? A Electrons are positive, protons are neutral, neutrons are negative. B Protons and neutrons have a charge of +1, while electrons have a much smaller charge. C Protons are positive, neutrons are neutral, electrons are negative. D Neutrons are positive, electrons are neutral, protons are negative. 3 Created by Boundless Which of the following statements accurately describes the locations of the three subatomic particles that make up an atom? A The protons, neutrons and electrons are all in the nucleus. B The neutrons and electrons are in the nucleus, while the protons orbit the nucleus. C The protons and electrons are in the nucleus, while the neutrons orbit the nucleus. D The protons and neutrons are in the nucleus, while the electrons orbit the nucleus. 4 Created by Boundless If an atom has a mass number of 18, what can be said about the number of protons and neutrons it contains? A It has 8 protons and 10 neutrons. B It has 9 protons and 9 neutrons. C It cannot be determined from the information given. D It has 10 protons and 8 neutrons. 5 Created by Boundless If an atom has 8 protons, what is its atomic number? 6 A It depends on the number of electrons in the atom. B It depends on the number of neutrons in the atom. C 16 D 8 Created by Boundless Which of the following statements concerning isotopes is true? A Isotopes are atoms of the same element that have different atomic masses. B Isotopes are atoms of different elements that have different atomic masses C Isotopes are atoms of different elements that have the same atomic mass. D Isotopes are atoms of the same element that have the exact same atomic mass. 7 Created by Boundless Which of the following measurements used in radiometric dating can be used to determine the age of fossils? A The increase in the amount of an unstable radioisotope according to its known half-life B The current half-life of a stable radioisotope in the sample C The amount of a radioisotope leached into surrounding environments according to its known half-life D The decrease in the amount of an unstable radioisotope according to its known half-life 8 Created by Boundless Which of the following electron configurations fulfills the octet rule? A The valence shell has one electron B The valence shell is half filled C The valence shell is completely filled D 9 The valence shell is one less than filled Created by Boundless Potassium has an atomic number of 19. What is its electron configuration according to the Bohr Model? A Shells 1 and 2 are full, while shell 3 has three electrons. B Shells 1, 2, 3, and 4 are full, while shell 5 has one electron C Shells 1, 2, and 3 are full, while shell 4 has one electron. D Shells 1 and 2 are full, while shell 3 has one electron. 10 Created by Boundless Which of the following happens during a reaction? A Chemical bonds are broken and/or formed between atoms. B Covalent bond are formed but not broken between atoms. C Ionic bonds are broken and/or formed between atoms. D Ionic bonds are formed but not broken between atoms. 11 Created by Boundless Which of the following is true of compounds? A Compounds are always made from the same kinds of elements. B Compounds are always human-made C Compounds have atoms of more than one type of element. D Compounds have double bonds between all of the atoms. 12 Created by Boundless Describe the shape and quantity of the 2s and 2p orbitals. A There are three spherical p orbitals and one dumbellshaped s orbital. B There is one spherical s orbital and three dumbell-shaped p orbitals. C There is one spherical p orbital and three dumbell-shaped s orbitals. D There are three spherical s orbitals and one dumbellshaped p orbital. 13 Created by Boundless Which of the following statements is true? A The Bohr model of the atom describes electrons as probability density wave functions B The Bohr model of the atom describes the location of the atoms in the periodic table C The quantum mechanical model of the atom describes electrons as probability density wave functions D The quantum mechanical model of the atom describes electrons as particles in defined orbits