UNIT # 3
Introduction
Objectives
Reading
3.1
Structure
of the Atom
3.2
Isotopes
3.3
Arrangement
of Electrons
3.4
Electron
Configura
tions
3.5
Atomic Mass
Problems
1
|
2
|
3
Unit # 3 - Atomic Structure
Names and symbols of elements and ions
Write the symbol for each atoms or ion. For example, 3 protons, 2 electrons = Li
+
25 protons, 30 neutrons, 25 electrons
94 protons, 150 neutrons, 94 electrons
13 protons, 14 neutrons, 10 electrons
Give the name and symbol of the element represented by
X
for each of the following isotopes:
188
X
76
34
X
2-
16
85
X
+
37
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British Columbia Institute of Technology
Chemistry Department - 3700 Willingdon Avenue
Burnaby, B.C. Canada V5G 3H2
Unit
# 3 - Atomic Structure 
