DATE
NAME
ATOMIC WEIGHTS
The weights of elements increase from left to right and from top to bottom of the
periodic table. The upper left corner is the lightest element and the lower right corner
?s the heaviest element Using a periodic table fill in the m.ssmg blanks After Qompletrng
Ihe columns, circle the heaviest e.ement and the lightest element. (Some of the dec.mal
fractions on the weights have been rounded o f f )
Weight (round off)
Element
Symbol
Ca
Carbon
Copper
Gold
4
1
Pb
201
Neon
195
Oxygen
226
Ag
Sodium
238
Name
ACTIVITY
Class
•
Date
Atoms: Building Blocks of Matter
Atomic Structure
You can become more familiar with the atomic structure of some common substances
by completing the chart below. For each substance, you have been given enough
information to fill in all the blanks.
Symbol
Atomic
Number
Mass
Number
Helium
He
2
4
Magnesium
Mg
12
Zinc
Zn
30
Bromine
Br
Aluminum
Al
Uranium
U
Sodium
Na
Krypton
Kr
Calcium
Ca
Silver
Ag
Substance
© Prentice-Hall. Inc.
Number of
Protons
Number of
Neutrons
Number of
Electrons
12
65
80
35
13
14
146
11
92
12
48
40
20
47
61
36
Elements - Understanding The Periodic Table
1. What is element name?
a. S
b. Ba
c. Fe
5. How many protons?
a. Mg
b. P
c. K
2. What is the element symbol
a. Zinc
b. Argon
c. Lead
6. How many electrons?
a. H
b. Ca
c. Al
3. What is the atomic #?
a. Li
b. Sn
c. Xe
7. How many neutrons?
a. Cu
b.Ag
c. Ni
4. What is the mass number?
a. Ne
b. Na
c.I
8. Solid, liquid gas?
a. Br
b. Mn
c.He
9. Metal, metalloid, or
Nonmetal?
a. As
b. F
c. Au
Short Answer
1. What is the symbol of the first element in Group 18?_
2. What is the symbol of the first element in Group 15? _
3. What is the symbol of the first element in Period 2?
4. What is the symbol of the first element in Period 3?
5. a. What is the atomic number of carbon?
b. How many protons are in the nucleus of a carbon atom?
6. Name the lightest element in Period 2.
7. Name the heaviest element in Period 2.
8. To which group does each of these elements belong?
a. lithium
e. nitrogen
f. oxygen
b. beryllium
c. boron
g. fluorine
d. carbon
h. neon