Isotopes of the same element have
A. no mass number.
B. the same mass number.
C. the same number of neutrons but different numbers of protons.
D. different numbers of protons and electrons.
E. the same atomic number but differ in their mass numbers.
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Question 2) The amount of matter in an object is its
A. size.
B. weight.
C. density.
D. volume.
E. mass.
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Question 3) The number of atoms in exactly 12 grams of carbon-12 is called
A. Socrates's number.
B. Le Chatelier's number.
C. Dalton's number.
D. Avogadro's number.
E. Pasteur's number.
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Question 4) A neutral atom will become a cation if it
A. gains neutrons.
B. gains electrons.
C. loses protons.
D. gains protons.
E. loses electrons.
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Question 5) In ionic bonding,
A. electrons are transferred from one atom to another.
B. the charge of the ion does not play a role in the bond.
C. only non-polar molecules are involved.
D. two hydrogen atoms share one pair of electrons.
E. a sea of electrons forms.
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Question 6) In an x-ray film of the skeletal system, the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.
A.
light, absorb; dark, do not absorb
B.
dark, absorb; light, do not absorb
C.
dark, do not absorb; light, do absorb
D.
light, do not absorb; dark, aborb
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Question 7) A neutral atom contains
A. more protons than electrons.
B. more electrons than protons.
C. the same number of electrons and protons.
D. only neutrons.
E. None of these choices is correct.
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Question 8) Which of the following best describes a proton?
A. one negative charge, no mass, found in orbitals
B. no charge, mass of one, found in nucleus
C. one positive charge, mass of one, found in nucleus
D. subatomic particle with no electric charge
E. None of these choices is correct.
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Question 9) An atom of chlorine has 17 protons and 18 neutrons. Which of the following statements is true?
A. Chlorine has an atomic number of 18.
B. Chlorine atoms have 18 electrons.
C. Chlorine has an atomic number of 35.
D. Chlorine has 35 electrons.
E. Chlorine has a mass number of 35.
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Question 10) The mass number of an atom is the number of
A. electrons plus neutrons in the atom.
B. neutrons in the atom.
C. neutrons plus protons in the atom.
D. protons in the atom.
E. protons plus electrons in the atom.
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