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Select the correct electron configurations from the list below. You can refer to the periodic table for atomic numbers. Check all that apply.
A) The electron configuration of O2− is [He]2s22p6.
B) The electron configuration of Cs is [Xe]6s05d1.
C) The electron configuration of Ag+ is [Kr]5s14d9.
D) The electron configuration of Si is [Ne]3s23p2.
E) The electron configuration of Ni is [Ar]4s23d8.

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Answer:

Corrects answer are Option A and Option D

Explanation:

[He]2s22p4 → This is the electron configuration for O, but if you have the anion, oxide it means that it gain 2 electrons. That's why you have 2 more e- in last cape.

[Ne]3s23p2 → The correct electron configuration for Si.

Si is an element from group 14. Its oxidation state is 4-´,

with a tendency to lose 4 electrons, the 2 of level 3s and level 3p. 4 electrons are being necessary to reach the gas noble configuration.

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