4. According to Hund's rule, when electrons occupy orbitals of equal energy, one electron enters each orbit until A B. C. D. all the orbitals contain one electron, with spin parallel all the orbitals contam one electron, with opposite spins there are two electrons in each orbital electron velocities become constant 5. If the first and 2nd energy levels of atom are fall, then what would be the total number o electrons in the atom? A 6 10 D 18 6. Which one of the following is NOT the electronic configuration of atom of a noble gas C
Answer (1)
Answer:1. According to Hund's rule, the correct answer is:A) all the orbitals contain one electron, with spin parallelHund's rule states that when electrons occupy orbitals of equal energy, they occupy each orbital singly with parallel spins before pairing up.1. If the first and 2nd energy levels of an atom are full, the total number of electrons is:C) 10First energy level (n=1): 2 electronsSecond energy level (n=2): 8 electronsTotal: 2 + 8 = 10 electrons1. The electronic configuration NOT corresponding to a noble gas atom is:Any configuration that doesn't match the noble gas configurations:He: 1s²Ne: 1s² 2s² 2p⁶Ar: 1s² 2s² 2p⁶ 3s² 3p⁶Kr: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶Xe: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶Rn: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶For example, 1s² 2s² 2p⁵ is not a noble gas configuration (it's actually the configuration of a halogen, fluorine).
