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Topic 4: Chemical bonding

30. Lewis electron-dot diagrams: Recognizing Lewis electron-dot for neutral atoms and ions
1. Which is the correct electron-dot diagram of a sulfur atom in the ground state?

1) 2) 3) 4)

2. Which Lewis electron-dot symbol represents an atom of argon in the ground state?
1) 2) 3) 4)

3. Electron configuration of atom X is 2 – 8 – 8 – 2. What is the correct electron-dot symbol for X?

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1) 2) 3) 4)

4. Which electron-dot symbol is correctly drawn for the atom it represents?

1) 2) 3) 4)

5. The X in the Lewis electron-dot diagram : X : could represent which element?
1) F 2) He 3) Si 4) Ca

6. Which is the correct electron-dot symbol for a chloride ion, Cl-?
.. ..
-
.
-
3) : Cl :
2) Cl -

1) : Cl :
.. . 4) Cl

7. Which diagram correctly represents the Lewis electron-dot diagram for oxygen ion?
. .. 2-
2-
2-
2-
1) : O :
4) : O :
. 2) O : 3) : O : ..

… .. …
3+
8. Which electron-dot symbol is correct for a B ion?

..
3+
3+
1) B 2) B 3) . B : 4) : B : 3+

..

9. The Lewis electron-dot symbol for a magnesium ion is

1) Mg 2) Mg : . . 2+ . . 2-
2+
2+
4) : Mg :
3) : Mg :
. . . .
10. An ion of atom X has 37 protons and 36 electrons. What is the correct Lewis - electron dot diagram for
this ion? - + . . - . . +

. . . .
1) X 2) X 3) : X : 4) : X :

11. Atom Y has a nuclear charge of +33 and 36 electrons. What is the correct Lewis electron-dot symbol
for this atom? .. ..
3-
3-
3+
1) . Y : 2) . Y : .. 3+ 4) : Y :
3) : Y :
..
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