5 What Do Atoms Look Like Chemistry Worksheet With Answers - South Pasadena Page 3
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5South Pasadena • Chemistry
Name ___________________________________
Period ___ Date ___/___/___
5 • What Do Atoms Look Like?
S I Z E S O F A T O M S & I O N S 5
For each pair, circle the LARGER one (size, not mass):
1.
N
F
6.
Ne
Ar
−
2+
2.
Mg
Mg
7.
Br
Br
3.
K
Ca
8.
Si
O
2−
3+
4.
O
O
9.
Al
Al
5.
S
Ar
10.
Na
F
South Pasadena • Chemistry
Name__________________________________
Period ___ Date ___/___/___
5 • What Do Atoms Look Like?
E L E C T R O N S O F I O N S 6
Complete the following tables:
−
+
2+
2−
Ne
Na
Mg
O
F
10
8
9
11
12
# protons
10
10
10
10
10
# electrons
−
+
2+
2−
Ar
K
Ca
S
Cl
18
16
17
19
20
# protons
18
18
18
18
18
# electrons
3+
Al
has the same number of electrons as the noble gas,
Neon (10 electrons)
−
I
has the same number of electrons as the noble gas,
Xenon (54 electrons)
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