multiple choice Indicate the letter that corresponds to the best answer in the s

Question

multiple choice Indicate the letter that corresponds to the best answer in the space provided. Give the set of four quantum numbers that represent the last electron added (using the Aufbau principle) to the Zn atom. A) n = 4, l = 3, m_l = 3, m_s = + 1/2 B) n = 3, l = 1, m_l = 1, m_s = - 1/2 C) n = 3, l = 1, m_l = 1, m_s = - 1/2 D) n = 3, l = 2, m_l = 2, m_s = + 1/2 E) n = 4, l = 1, m_l = 0, m_s = + 1/2 In order to produce sp^3 hybrid orbitals, ________ s atomic orbital(s) and _______ p atomic orbital(s) must be mixed. A) one, two B) one, three C) one, one D) two, two E) two, three Give the number of core electrons for Se. A) 26 B) 30 C) 28 D) 32 E) 34 In general, as you go across a period in the periodic table from left to right: the atomic radius the electron affinity becomes _______ negative; and the first ionization energy ________. A) decreases, less, increases B) increases, more, decreases C) increases, more, increases D) decreases, more, increases E) decreases, more, decreases

Explanation / Answer

1) B
2) B
3) C
Core electrons being the number of electrons excluding its valence (outer and partially filled) shells = 28.
Its atomic number is 34 so it has 34 electrons in the atom, however, there are 6 in the outer shell
(as it is in Group 6 of the periodic table) so that leaves 28 for the core.
4) A

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