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Worksheet 12 . Topic 3

Set C: Particles in atoms and ions Objective: To test your ability to determine information
from atomic and ionic symbols.

Below, symbol of an atom or ion is given. Complete the table below based on the symbol given
Atom and Ion Atomic Number of Number of Number of Electron configuration
protons
number
symbols
neutrons
electrons

13.
C
14.
4-
C

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15.
Sr
16.
2+
Sr

17. 27
Al
18.
3+
27 Al

31 Teacher Preview Copy
19. P

P
20. 31 -3

Set D: Determining charge of atom. Objective: To test your ability to determine charge of

atoms based on the number of subatomic particles
Determine the charge of each atom based on information given.

21. Atom A: 46 protons, 61 neutrons, 42 electrons. Charge =

22. Atom B: mass number of 209, nuclear charge of 83, and 81 electrons: Charge =

23. Atoms C: nuclear charge of 32, 36 electrons , 39 neutron Charge =

24. Atoms D: 54 electrons, 122 nucleons, atomic number 51 Charge =

25. Atom E: 28 neutrons, nuclear charge of 22, 20 electrons Charge =

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