which of the following represent the proper long hand form electron configuration of zirconium, zr, using…
which of the following represent the proper long hand form electron configuration of zirconium, zr, using the building - up principle?\nkr 5s² 4d²\nkr 4d² 5s²\n1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s² 4d²\n1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d² 5s²\n1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d²\n\nquestion 4\n1 pts\nwhich of the following represent the proper short hand form electron configuration of yttrium, y, using the building - up principle?\nkr 5s² 4d¹\nxe 5s² 4d¹\n1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹\n1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹ 5s²\nkr 4d¹ 5s²
Answer
Explanation:
Step1: Recall electron - filling order
Electrons fill orbitals in the order 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d etc. according to the building - up principle.
Step2: Determine atomic number of zirconium (Zr)
Zirconium has an atomic number of 40. The noble - gas core before Zr is Kr (atomic number 36). So, we need to account for 40 - 36=4 more electrons. These electrons fill the 5s and 4d orbitals. The 5s orbital fills before the 4d orbital and can hold 2 electrons, and then the 4d orbital holds the remaining 2 electrons. The long - hand electron configuration of Zr is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}5s^{2}4d^{2}$.
Step3: Determine atomic number of yttrium (Y)
Yttrium has an atomic number of 39. The noble - gas core before Y is Kr (atomic number 36). We need to account for 39 - 36 = 3 more electrons. The 5s orbital fills first and can hold 2 electrons, and then the 4d orbital holds 1 electron. The short - hand electron configuration of Y is $[Kr]5s^{2}4d^{1}$.
Answer:
Question 1: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}5s^{2}4d^{2}$ Question 2: $[Kr]5s^{2}4d^{1}$