Problem: Which of the following statements is/are true? i. the electron configuration of copper, Cu, is  [Ar]4s 23d9 ii. the electron configuration of iron(II), Fe2+, is  [Ar]3d 6 iii. the electron configuration of molybdenum, Mo, is [Kr]5s14d5 a. i only b. ii only c. iii only d. i and ii  e. ii and iii

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Which of the following statements is/are true?

i. the electron configuration of copper, Cu, is  [Ar]4s 23d9

ii. the electron configuration of iron(II), Fe2+, is  [Ar]3d 6

iii. the electron configuration of molybdenum, Mo, is [Kr]5s14d5

a. i only

b. ii only

c. iii only

d. i and ii 

e. ii and iii

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