Atomic Structure
Element
Symbol Atomic Mass
(common
Number Number
isotope)
Hydrogen H
1
1
Helium
He
2
4
Lithium
Li
Nitrogen N
Oxygen
O
Silicon
Si
Krypton
Kr
Lead
Pb
Uranium
U
Plutonium Pu
Isotopes
Element
3
7
8
14
36
82
92
94
7
14
16
28
84
207
238
242
Number of Particles in the Atom
Protons
Neutrons Electrons
1
2
3
7
8
14
36
82
92
94
0
2
4
7
8
14
48
125
146
148
1
2
3
7
8
14
36
82
92
94
Isotope Number of Particles in the Atom
Protons
Neutrons Electrons
Hydrogen
1
1
H
Deuterium
2
1
H
Tritium
3
1
H
Chlorine-35
35
17
Chlorine-37
37
17
Carbon-12
12
6
Carbon-14
14
6
Uranium-235
Uranium-238
Cl
1
1
1
17
0
1
2
18
1
1
1
17
Cl
17
20
17
C
6
6
6
8
6
6
235
92
92
143
92
238
92
92
146
92
C
U
U
What is different about isotopes of the same element? (2 things)
What do isotopes of the same element have in common? (3 things)