Question

1. Write out the electron configuration for each atom. Then, predict the change that must occur in each to achieve a noble-gas configuration.

a. nitrogen

b. barium

c. lithium

Answer 1

Nitrogen - 1s²2s²2p³

Nitrogen needs to gain 3 electrons in order to reach nearest noble gas configuration of Neon.

Barium - 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²

Barium needs to lose 2 electrons in order to reach nearest noble gas configuration of Neon.

Lithium - 1s²2s¹

Barium needs to lose 1 electron in order to reach nearest noble gas configuration of Helium.

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Answer 2

Answer:

it would need to lose three electrons, becoming N⁺³

it would need to lose two electrons, becoming Ba²⁺

it would need to lose one electron, becoming Li⁺

Explanation:

a. Nitrogen (atomic number 7) has the electron configuration of 1s² 2s² 2p³. To achieve a noble-gas configuration, it would need to lose three electrons, becoming N⁺³ with the configuration of 1s² 2s² 2p⁵.

b. Barium (atomic number 56) has the electron configuration of [Xe] 6s². To achieve a noble-gas configuration, it would need to lose two electrons, becoming Ba²⁺ with the configuration of [Xe] 6s².

c. Lithium (atomic number 3) has the electron configuration of 1s² 2s¹. To achieve a noble-gas configuration, it would need to lose one electron, becoming Li⁺ with the configuration of 1s² 2s².

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