In the multielectron system, the energy of an electron is determined by: A. the

Question

In the multielectron system, the energy of an electron is determined by: A. the principal quantum number n B. the quantum numbers n and l C. the orientation, ml D. the magnetic spin, m_s 80g of ammonium, nitrate dissolved in water causes an enthalpy change, Delta H, of +25.7 kJ/mol. Which of the following best describes the process: A. The Delta H for ammonium nitrate is +25.1 kJ/mol so this is an endothermic process where energy in the form of heat is absorbed from the surroundings B. The Delta H for ammonium nitrate is +25.7 kJ/mol so this is an exothermic process where energy in the form of heat is released into the surroundings C. The Delta H for ammonium nitrate is +25.7 kJ/mol so this is an endothermic process where energy in the form of heat is released into the surroundings D. The Delta H for ammonium nitrate is +25.7 kJ/mol so this is an exothermic process where energy in the form of heat is absorbed from the surroundings What is the ground-state electron configuration of calcium? A. 1s^22s^22p^63s^23p^64s^2 B. 1s^2 2s^2p^6 C. 1s^2 2s^2 2p^3s^2 D. 1s^42s^42p^63s^23p^4 Which element has the smallest first ionization energy? A. Na B. greaterthanorequalto C. Se D. F Which is the condensed electron configuration of radium (Ra)? A. [Xe]4s^23d^9 B. [Rn]4s^23d^9 C. [Rn]6s^26p^1 D. [Rn]7s^2

Explanation / Answer

16. A. The principal quantum number n

17. A. The H for ammonium nitrate is +25.7 KJ/mol, so this is an endothermic process where energy in the form of heat is absorbed from surroundings.

18. A. 1s22s22p63s23p64s2

19. A. Na

20. D. [Rn] 7s2

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