The orbital diagram for a ground-state oxygen atom is A) A B) B C) C D) D E) E W
ID: 1005542 • Letter: T
Question
The orbital diagram for a ground-state oxygen atom is A) A B) B C) C D) D E) E Which element has the following ground-state electron configuration? 1s^22s^22p^63s^2 A) Na B) Mg C) AI D) Si E) Ne 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 The ground-state electron configuration of Cr, Mo, and Ag are exceptions to the Aufbau principle. Which of the following is the electron configuration for Mo? A) [Kr]5s^14d^5 B) [Kr]5s^24d^4 C) [Xe]6s^25d^4 D) [Ar]4s^24d^4 E) [Kr]5s^24d^6 The law of octaves states that every eighth clement has similar properties when arranged in order of increasing A) nuclear binding energy. B) number of electrons. C) number of neutrons. D) atomic mass. E) atomic number. Mendeleev proposed the existence of an unknown element that he called eka-aluminum. This element is now called A) gallium. B) silicon. C) magnesium. D) boron. E) germanium. Which of the following is the general electron configuration for the outermost electrons of elements in the alkaline earth group? A) ns^1 B) ns^2 C) ns^2np^4 D) ns^2np^5 E) ns^2np^6(n-1)d^6Explanation / Answer
8. D
Oxygen have 8 electrons and according to hunds rule.
9. B
Mg have atomic number equal to 12
10. D
Mn have atomic number of 25
11. A
12. D
13. A
14. B
Group 2 metals