ATOMS​:
The Atom
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Using page 4 of your Pearson Science 9 textbook, fill in the
following table:
Subatomic Particles Table:
Subatomic
particle
Proton
Neutron
Electron
Charge (positive,
Where it can be
negative or neutral) found in the atom
Its mass in amu
(atomic mass units)
Nuclear Symbols:
This is how an element is represented as a nuclear symbol:
So helium would be written as
Atomic Number​:
Using your Periodic Table, you will see that every element has an
atomic number. For example, helium (He) above has an atomic number
of 2.
*Note that the symbols are always a capital letter if there is only 1 letter (such as H), and a capital letter followed by a
lowercase letter if there are 2 letters (such as He).
The ​atomic number​ = number of ​protons​ that the atom has.
Atomic Mass:
Atomic mass = number of protons + number of
neutrons
Using your periodic table, fill in the blanks for the first 20 elements below.
Don’t forget that in order for the atom to be neutrally charged, the
number of electrons = number of protons. The first two have been
completed for you:
Atomic
number
Element
1
Nuclear
Symbol
Atomic
Mass
(amu)
Number
of
protons
Number
of
neutron
s
Number
of
electron
s
Hydrogen
1
1
0
1
2
Helium
4
2
2
2
3
Lithium
7
3
4
Beryllium
9
4
5
Boron
6
Carbon
7
Nitrogen
8
Oxygen
9
Fluorine
4
3
7
6
14
7
8
19
6
8
9
10
Neon
10
11
Sodium
12
Magnesium
13
Aluminium
14
Silicon
15
Phosphorus
31
16
Sulfur
32
17
Chlorine
35
18
Argon
19
Potassium
20
Calcium
23
10
11
12
27
13
16
16
17
18
39
12
22
19