3.3.1.0: Lewis Dot Diagrams (Problems)

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PROBLEM \(\PageIndex{1}\)

Write the Lewis symbols for each of the following ions:

As^3–
I^–
Be²⁺
O^2–
Ga³⁺
Li⁺
N^3–

Answer a: eight electrons:

Answer b

eight electrons:

Answer c

no electrons

Be²⁺

Answer d

eight electrons:

Answer e

no electrons

Ga³⁺

Answer f

no electrons

Li⁺

Answer g

eight electrons:

PROBLEM \(\PageIndex{2}\)

Write the Lewis symbols for the following elements:

Answer a

Answer b

Answer c

Answer d

Answer e

Answer f

Answer g

Answer h

PROBLEM \(\PageIndex{3}\)

Write the Lewis symbols of the ions in each of the following ionic compounds and the Lewis symbols of the atom from which they are formed:

a. MgS
b. Al₂O₃
c. GaCl₃
d. K₂O
e. Li₃N
f. KF

Answer a

Answer b

Answer c

Answer d

Answer e

Answer f

PROBLEM \(\PageIndex{4}\)

In the Lewis structures listed here, M and X represent various elements in the third period of the periodic table. Write the formula of each compound using the chemical symbols of each element:

(a)

Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted two positive sign. The right shows the symbol X surrounded by four lone pairs of electrons with a superscripted two negative sign outside of the brackets.

(b)

Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted three positive sign. The right structure shows the symbol X surrounded by four lone pairs of electrons with a superscripted negative sign and a subscripted three both outside of the brackets.

(c)

Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted positive sign and a subscripted two outside of the brackets. The right structure shows the symbol X surrounded by four lone pairs of electrons with a superscripted two negative sign outside of the brackets.

(d)

Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted three positive sign and a subscripted two outside of the brackets. The right structure shows the symbol X surrounded by four lone pairs of electrons with a superscripted two negative sign and subscripted three both outside of the brackets.

Answer a: MgS

Answer b: AlCl₃

Answer c: Na₂S

Answer d: Al₂S₃

PROBLEM \(\PageIndex{5}\)

Identify the atoms that correspond to each of the following electron configurations.

a. 1s²2s²2p⁵
b. 1s²2s²2p⁶3s²
c. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴
d. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p¹

Answer a: F

Answer b: Mg

Answer c: Se

Answer d: Ga

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Contributors and Attributions

Paul Flowers (University of North Carolina - Pembroke), Klaus Theopold (University of Delaware) and Richard Langley (Stephen F. Austin State University) with contributing authors. Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution License 4.0 license. Download for free at http://cnx.org/contents/85abf193-2bd...a7ac8df6@9.110).
Adelaide Clark, Oregon Institute of Technology

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