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An element with the same number of valence electrons as the element with the electron configuration 1s2 2s2 2p6 3s2 3p5 is


A) iodine.
B) oxygen.
C) argon.
D) potassium.
E) sulfur.

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Which column of the periodic table contains only nonmetals?


A) 4A
B) 5A
C) 6A
D) 7A
E) 3A

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The value of Z for the element 37Ar is


A) 37.
B) 39.945.
C) 19.
D) 21.945.
E) 18.

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Which group contains only f-block elements?


A) Ni,Pd,Pt
B) Si,Ge,As
C) Ce,Pr,Nd
D) Kr,Xe,Rn
E) Po,Fr,Ac

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Which of the following represents a pair of isotopes?


A) Which of the following represents a pair of isotopes? A) C, N B) H, H C) S, S<sup>2</sup> D) O<sub>2</sub>,O<sub>3</sub> E) all are pairs of isotopesC, Which of the following represents a pair of isotopes? A) C, N B) H, H C) S, S<sup>2</sup> D) O<sub>2</sub>,O<sub>3</sub> E) all are pairs of isotopesN

B) Which of the following represents a pair of isotopes? A) C, N B) H, H C) S, S<sup>2</sup> D) O<sub>2</sub>,O<sub>3</sub> E) all are pairs of isotopesH, Which of the following represents a pair of isotopes? A) C, N B) H, H C) S, S<sup>2</sup> D) O<sub>2</sub>,O<sub>3</sub> E) all are pairs of isotopesH

C) Which of the following represents a pair of isotopes? A) C, N B) H, H C) S, S<sup>2</sup> D) O<sub>2</sub>,O<sub>3</sub> E) all are pairs of isotopesS,Which of the following represents a pair of isotopes? A) C, N B) H, H C) S, S<sup>2</sup> D) O<sub>2</sub>,O<sub>3</sub> E) all are pairs of isotopesS2

D) O2,O3
E) all are pairs of isotopes

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Cobalt is element 27.Cobalt-60 is used in the medical treatment of cancer.How many neutrons and protons are contained in the nucleus of this isotope?


A) 27 neutrons,33 protons
B) 33 neutrons,27 protons
C) 27 neutrons,27 protons
D) 33 neutrons,33 protons
E) 60 neutrons,27 protons

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The number of valence electrons in a main group element is given by


A) atomic number.
B) atomic weight.
C) group number.
D) mass number.
E) none of the above.

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Which group contains only d-block elements?


A) Ni,Pd,Pt
B) Si,Ge,As
C) Ce,Pr,Nd
D) Kr,Xe,Rn
E) Po,Fr,Ac

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What is the electron configuration of Fe?


A) 1s2 2s2 2p6 3s2 3p6 3d8
B) 1s2 2s2 2p6 3s2 3p6 4s2 3d6
C) 1s2 2s2 2p6 3s2 3p6 4s2 4p6
D) 1s2 2s2 2p6 3s2 3p6 4s2
E) 1s2 2s2 2p6 3s2 3p6 3d6

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Another name for atomic mass unit (amu) is the


A) avogadro.
B) dalton.
C) Kekule
D) kelvin.
E) mendeleev.

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The number of neutrons in an atom is equal to


A) atomic number - mass number.
B) mass number - atomic number.
C) the atomic number.
D) the mass number.

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The number of valence electrons in an element with electron configuration 1s2 2s2 2p6 3s2 3p4 is


A) 2.
B) 4.
C) 6.
D) 8.
E) 16.

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Valence electrons in the main group elements are contained in which type(s) of orbitals?


A) s
B) p
C) s and p
D) d
E) f

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Which group contains only p-block elements?


A) N,S,Br
B) Mn,Cu,Ag
C) K,Mg,Al
D) Ce,Pr,Nd
E) Na,P,Cl

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How many neutrons does an atom of How many neutrons does an atom of Ti have? A) 0 B) 22 C) 24 D) 46 E) 68Ti have?


A) 0
B) 22
C) 24
D) 46
E) 68

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What fourth period element is represented by the dot structure shown? X:


A) K
B) Ca
C) V
D) As
E) Ti

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