Lewis Dot Structure Practice Page 2

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2. Fill in the following chart. Remember that ions have a charge, so the proton number (atomic
number) does not equal the electron number. Protons + electrons = charge.
Symbol and
Similar to this
Name of Ion
Proton
Electron
Charge
noble gas
2+
calcium ion
20
18
Ca
Argon
1-
Br
sulfide ion
12
10
9
10
lithium ion
3+
Al
2+
Be
sodium ion
oxide ion
7
10
17
18
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