Name: _____________________________________________________________
Chapter 4: Atomic Structure
Atomic Mass, Elements, Isotopes and Ions Miniseries
Watch the following videos, take notes and fill on the following worksheets based on those notes.
1. Atomic Mass
http://www.youtube.com/watch?v=7fYpEnxhKQk
2. What are Isotopes?
http://www.youtube.com/watch?v=EboWeWmh5Pg
4. Isotopes and Elements Practice
http://www.youtube.com/watch?v=n4WZ0-fItt8
3. What’s an Ion?
http://www.youtube.com/watch?v=WWc3k2723IM
1
A. ATOMIC STRUCTURE & AVERAGE ATOMIC MASS
PARTICLE
proton
LOCATION
nucleus
CHARGE
+1
RELATIVE MASS
1 (1 amu)
ACTUAL MASS
1.67 x 10-24g
neutron
nucleus
1 (1 amu)
1.67 x 10-24g
electron
Outer energy levels
None
Neutral
-1
~0 (1/1840 amu)
9.11 x 10-28g
1. Complete the statements below. The statements refer to the periodic table box pictured:
11
Na
22.9897
a.
The number “11” is the __________________________. It tells the number of ________________
and _______________________ in a neutral atom of the element.
b. The number “22.9897” is the ________________________. It tells the weighted average atomic mass
of all the isotopes of an element.
c. The number “22.9897” can be rounded to 23, which is called the atomic mass number. This tells the
total number of _________________ and _______________________ in the nucleus of the atom.
d. The number of neutrons in the nucleus of an atom can be determined by (what’s the formula?):
__________________________________________________________________________________
2
2. Use your periodic table to complete the chart below:
ELEMENT
Manganese
SYMBOL
ATOMIC
NUMBER
ATOMIC
MASS #
Mn
25
55
Ar
18
40
Argon
PROTONS
NEUTRONS
ELECTRONS
25
30
25
18
22
18
Sodium
Iron
Ba
47
24
35
50
B. ELEMENTS, ISOTOPES & IONS
isotope:
isotopic notation:
carbon -14
Element name – mass number
Name
Symbol
Beryllium-8
Beryllium-9
14
6𝐶
C-14
Element symbol – mass number
𝑚𝑎𝑠𝑠 𝑛𝑢𝑚𝑏𝑒𝑟
𝑎𝑡𝑜𝑚𝑖𝑐 𝑛𝑢𝑚𝑏𝑒𝑟
element symbol
p
n
e
Be
Atomic Mass
Number
8
4
4
4
Be
9
4
5
4
Name
Symbol
Atomic Mass
Number
p
n
e
calcium ion
Ca2+
oxygen ion
O2-
ion:
3
Complete the chart below:
ELEMENT
SYMBOL ATOMIC ATOMIC
NUMBER MASS #
PROTONS
NEUTRONS ELECTRONS
magnesium
Sn
38
22
barium-140
lead-210
60Co
240U
8
magnesium
ion
Mg2+
aluminum ion
Al3+
nitride ion
N3-
fluoride ion
F1-
4
9
33
45
19
21
XXXX
37
36
XXXX
16
18
PRACTICE: Complete the following chart.
Name
Symbol
Atomic
Number
Mass
Number
Protons
Neutrons Electrons
𝟏
𝟏𝑯
hydrogen ion
𝟏 +
𝟏𝑯
𝟏𝟐
𝟔𝑪
𝟕 +
𝟑𝑳𝒊
𝟑𝟓 𝟏𝟕𝑪𝒍
potassium-40
𝟒𝟎
𝟏𝟗𝑲
magnesium
24
27
arsenic ion
39
36
47
47
46
90
56
5
140
84
90
0
