A ground-state atom of manganese has _____unpaired electrons and is _____ A) 0,

Question

A ground-state atom of manganese has _____unpaired electrons and is _____ A) 0, diamagnetic B) 2, diamagnetic C) 3, paramagnetic D) 5, paramagnetic E) 7, paramagnetic Which choice lists two elements with ground-state electron configurations that are well known exceptions to the Aufbau principle? A) Cu and C B) Cr and Cu C) Cs and Cl D) Rb and Co E) Fe and Co Which two electron configurations represent elements that would have similar chemical properties? (1) 1s^2 2s^2 2p^4 (2) 1s^2 2s^2 2p^5 (3) [Ar]4s^2 3d^5 (4) [Ar]4s^2 3d^10 4p^5 A) (1) and (2) B) (1) and (3) C) (2) and (3) D). (2) and (4) E)(3) and (4) Consider the element with the electron configuration [Xe] 6s^2 4f^. This element is A) a representative element B) a lanthanide element C) a nonmetal D) an actinide element E) a noble gas How many valence electrons does an oxygen atom have? A) 2 B) 4 C)6 D) 7 E) 8 How many valence electrons does a tin (S_n) atom have? A) 2 B) 4 C) 14 D) 36 E) 50 Which of the atoms listed below has the smallest radius? A) Al B) P C) As D) Te E) Na Arrange the following ions in order of increasing ionic radius: K^, p^-, S^2-, Cl^-, increasing radius A) K^+

Explanation / Answer

28)

Number of electron in Mn = 25

Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d5 4s2

It has 5 unpaired electrons in d orbital

Since it has unpaired electron, it is paramagnetic

Answer: D

29)

1st exception is Cu

Number of electron in Cu = 29

Electronic configuration is: 1s2 2s2 2p6 3s2 3p6 4s1 3d10

Explanation: Half filled and fully filled orbital are more stable.

so instead of 4s2 3d9, we go for 4s1 3d10 where both orbitals are either half filled or fully filled

2nd exception is Cr

Number of electron in Cr = 24

Electronic configuration is: 1s2 2s2 2p6 3s2 3p6 4s1 3d5

Explanation: Half filled orbital are more stable.

so instead of 4s2 3d4, we go for 4s1 3d5 where both orbitals are half filled

Answer: B

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