87. What is the electron configuration for the barium atom? (A) 1s22s22p63p64s2 (B) 1s22s22p63s23p64s1 (C) 1s22s22p63s23p63d104s2(D) [Xe] 6s2 (E) 1 s22s22p63s2

87. What is the electron configuration for the barium atom?
(A) 1s²2s²2p⁶3p⁶4s²
(B) 1s²2s²2p⁶3s²3p⁶4s¹
(C) 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²
(D) [Xe] 6s²
(E) 1 s²2s²2p⁶3s²

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統計： A(0), B(0), C(2), D(17), E(1) #3222854

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90. Please choose the correct description for confidence level. (A) Confidence level is the probability that the sample mean lies within a certain interval. (B) Confidence level is the probability that the true mean lies within a certain interval. (C) Confidence level is the range of values within which the population mean is expected to lie with a certain probability. (D) Confidence level is the range of values within which the true value is expected to lie with a certain probability, (E) None of the above.

87. What is the electron configuration for the barium atom?
(A) 1s²2s²2p⁶3p⁶4s²
(B) 1s²2s²2p⁶3s²3p⁶4s¹
(C) 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²
(D) [Xe] 6s²
(E) 1 s²2s²2p⁶3s²

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