Exam 2: Atoms and Elements

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A) Ar
B) Br
C) N
D) O
E) K

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A) 54
B) 172
C) 64
D) 110
E) 118

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A) selenium
B) silicon
C) sulfur
D) scandium

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A) 27
B) 29
C) 31
D) 64

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A) Atoms combine in simple whole number ratios to form compounds.
B) All atoms of chlorine have identical properties that distinguish them from other elements.
C) One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide.
D) Atoms of sodium do not change into another element during chemical reaction with chlorine.
E) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen.

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A) Br,Br^-,Br⁺
B) N,O,F
C) Na⁺,Mg²⁺,Al³⁺
D) K⁺,Rb⁺,Cs⁺

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A) 106.905 amu
B) 106.908 amu
C) 106.903 amu
D) 106.911 amu

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A) A neutral atom contains the same number of protons and electrons.
B) Protons have about the same mass as electrons.
C) Electrons make up most of the mass of an atom.
D) Protons and neutrons have opposite,but equal in magnitude,charges.
E) Neutrons and electrons are found in the nucleus of an atom.

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The average atomic mass of sil...

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A) 4.75 × 10^-3 moles Kr
B) 33.4 moles Kr
C) 2.11 × 10^-4 moles Kr
D) 2.99 × 10^-3 moles Kr
E) 1.19 × 10^-4 moles Kr

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A) 3.9 × 10² g
B) 2.4 × 10² g
C) 3.2 × 10² g
D) 1.5 × 10² g
E) 6.5 × 10² g

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A) Halogens are very reactive elements.
B) The alkali metals are fairly unreactive.
C) Sulfur is a main group element.
D) Noble gases do not usually form ions.
E) Zn is a transition metal.

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A) mercury
B) chlorine
C) scandium
D) bromine
E) selenium

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A) Anions are usually larger than their corresponding atom.
B) Metals tend to form cations.
C) Atoms are usually larger than their corresponding cation.
D) The halogens tend to form 1+ ions.
E) Nonmetals tend to gain electrons.

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A) p⁺ = 36 n° = 29 e^- = 36
B) p⁺ = 29 n° = 29 e^- = 36
C) p⁺ = 36 n° = 36 e^- = 29
D) p⁺ = 29 n° = 36 e^- = 29
E) p⁺ = 29 n° = 36 e^- = 36

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A) 0.352 kg
B) 0.122 kg
C) 0.820 kg
D) 0.280 kg
E) 0.632 kg

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A) 5.90 × 10²⁵ Li atoms
B) 7.09 × 10²¹ Li atoms
C) 8.49 × 10²⁴ Li atoms
D) 4.27 × 10²² Li atoms
E) 4.18 × 10²⁴ Li atoms

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