Which element has the following ground state electron configuration? a. In b. Y

Question

Which element has the following ground state electron configuration? a. In b. Y c. Nb d.T1 e. The ground-state electron configuration of a Mn^2+? ion is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5. Therefore, Mn^2+ is a. paramagnetic with five unpaired electrons. b. diamagnetic. c. paramagnetic with one unpaired electron. d. paramagnetic with three unpaired electrons. e. paramagnetic with two unpaired electrons. Which ground-state electron configuration is incorrect? a. Br: [Ar]3d^10 4s^2 4p^5 b. K: [Ar]4s^1 c. Fe: [Ar] 3d^5 d. Mg: 1s^2 2s^2 2p^6 3s^2 e. Zn: [Ar]3d^10 4s^2 What 2+ ion has the following ground state electron configuration? a. Mn^2+ b. Co^2+ c. Ni^2+ d. Cu^2+ e. Ge^2+ The procedure by which electrons are assigned to (or built up into) orbitals is known as the ___ principle. a. Aufbau b. Bohr c. Planck d. Hund e. Pauli An atom of which of the following elements has the smallest atomic radius? a. Cl b. K c. Ca d. Si e. P What is the maximum number of electrons that can occupy then n = 2 shell? a. 2 b. 8 c. 18 d. 32 e. 50

Explanation / Answer

21. answer is (a)

22. answer is (a), paramagnetic as there are unpaired electrons in d-orbitals

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