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Worksheet 9 . Topic 3

Set C: Determining number of atomic particles Objective: To test your ability to determine number
of particles in an atom .

14. Complete the table below based on information provided for each atom. All the atoms are neutral.

Protons electrons Neutrons Mass Atomic Nuclear Nucleons Element’s
Number number charge symbol
Atom A 44 102

Atom B 84 125
Atom C 56 Mn
Teacher Preview Copy

Atom D 89 229
Atom E
30 +28
Atom F 92 233

Atom G 82 Ba

Set D: Isotope symbols Objective: To test your ability to relate isotope symbol to number

of particles in an atom

243 Teacher Preview Copy

15. Complete the table below based on information provided for each atom/ All the atoms are neutral.

Isotope Protons electrons neutrons Mass Atomic Nuclear Nucleons Nucleus
symbol number number charge Diagram

Atom H 142 Pr
59

Atom I 31 +27

Atom J Am

95

Atom K 77 194

Atom L 80
Se

Atom M 22 p
26 n

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