1. What is an atomic number? a mass number?
2. How are the atomic and mass numbers of elements/ions used to identify the number of protons, electrons and neutrons?
3. Complete the following table.
Name of Element
|
Element
Symbol
|
Mass
Number
|
Atomic
Number
|
Protons
|
Neutrons
|
Electrons
|
Boron
|
B
|
11
|
5
|
5
|
6
|
5
|
Sodium
|
23
|
11
|
||||
Y
|
89
|
39
|
||||
Copper
|
29
|
35
|
||||
Tc
|
98
|
43
|
||||
Pb
|
207
|
|||||
Thallium
|
204
|
81
|
||||
H
|
0
|
|||||
Carbon
|
12
|
|||||
N
|
7
|
|||||
Ba
|
56
|
|||||
Calcium
|
||||||
Si
|
14
|
|||||
Argon
|
18
|
|||||
Mg
|
12
|
12
|
No comments:
Post a Comment