12. One of the ionic forms of iron has a charge of +2. How many protons does the ion have? 13. Which of the following electron configurations corresponds to an atom of a transition metal? Group of answer choices 1s22s22p5 none of the choices 1s22s22p63s23p2 1s22s22p63s23p64s23d104p3 1s22s22p63s23p64s1 1s22s22p63s23p64s23d2 14. The atomic mass unit (u) is based on which isotope of carbon? Group of answer choices C-14 C-12 C-11 C-13

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12. One of the ionic forms of iron has a charge of +2. How many protons does the ion have?

13.

Which of the following electron configurations corresponds to an atom of a transition metal?
Group of answer choices

1s22s22p5

none of the choices

1s22s22p63s23p2

1s22s22p63s23p64s23d104p3

1s22s22p63s23p64s1

1s22s22p63s23p64s23d2

14. The atomic mass unit (u) is based on which isotope of carbon?
Group of answer choices

C-14

C-12

C-11

C-13

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