ATOMIC STRUCTURE WORKSHEET
1.
Complete the table. There is enough information given for each
element to determine all missing numbers.
Symbol
Atomic
Number
Mass
Number
Number of
Protons
Number of
Electrons
Number of
Neutrons
23Na
K
40
19
38
38
F
52
10
20
41
18
50
50
72
131I
26Mg
109
1
2
47
46
1
36S
26
23
27Al
2
Cr
4
53
2
32
2.
Use the terms from the following list to complete the sentences
below. Each term may be used only once. Some terms may not
be used.
atom atomic number
electron
nucleus
electron cloud proton
isotope
neutron
1.
A positively charged particle in the nucleus of an atom is called a(n)
______________________
2.
An atom of an element that has the same number of protons, but different
numbers of neutrons is called a(n) ______________________.
3.
The region in an atom that contains most of the mass is called the
______________________.
4.
The number of protons in an atom determines its ______________________.
5.
The smallest particle into which an element can be divided and still be the
same substance is a(n) ______________________.
3.
Complete each of the following sentences by choosing the
correct term from the word bank.
group period alkali metals halogens noble gases
1.
Elements in the same vertical column on the periodic table belong to the
same ______________________.
2.
Elements in the same horizontal row on the periodic table belong to the same
______________________.
3.
Elements that are unreactive are called ______________________.
4.
Use the following diagram to answer the following questions:
1. Which letter refers to the negatively charged particles?
…………….
2. Which letter refers to the positively charged particles?
…………….
3. Which letter refers to the particles with no charge?
……………
4. Which letter refers to the center of the atom?
…………….
5. Fill in the blank spaces in the table below which refers to ions
of different elements and the fundamental particles present in
them.
Ion
Al3+
K+
71Ga3+
Atomic
no.
13
Neutrons
Electrons
14
22
31
37
17
9
10
17
Ti4+
69Ga3+
6.
Proton
s
19
37Cl F35Cl -
Mass
no.
18
48
18
31
Li +
3
Cu2+
29
7
34
Describe how an ion of sodium and an ion of chlorine is formed. You can use a
diagram.
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