Atomic Structure Worksheet



Name Period Date

Atomic Structure and Isotopes

Part A – Subatomic Particles

The table below contains information about several elements. In each case, enough information has been provided for you to fill in the blanks. Assume all atoms are neutral.

|Isotope |Isotope Symbol |Atomic Number |Mass Number |# of Protons |# of Electrons |# of Neutrons |

|Name | | | | | | |

|calcium-40 | | | | | | |

| | |12 |24 | | | |

| | | | |1 | |2 |

| |[pic] | | | | | |

| | | | | |26 |30 |

| | | |201 |80 | | |

| | |17 | | | |18 |

Part B – Average Atomic Mass

1. Calculate the average atomic mass for neon if its abundance in nature is 90.5% neon-20, 0.3% neon-21, and 9.2% neon-22.

2. Calculate the average atomic mass of silver if 13 out of 25 atoms are silver-107 and 12 out of 25 atoms are silver-109.

What is the average atomic mass of the following isotopic mixtures? Show your work!!

10) 22.00% of 159.3 amu; 78.00% of 161.2 amu. 

 

11) 42.10 amu - 93.50%; 48.30 amu - 6.200%; 50.40 amu - 0.3000%

12)  75.0 % 133Cs with a mass of 132.97 amu, 20.0 % 132Cs with a mass of 131.98 amu, and 5.00 % 134Cs with a mass of 133.982 amu

13) 80.00 % 127I with a mass of 126.963 amu, 17.00 % 126I with a mass of 125.984 amu, 3.00 % 128I with a mass of 127.992 amu

14) 50.00 % 197Au with a mass of 196.798 amu, 50.00 % 198Au with a mass of 197.882 amu

15)  15.35 % 55Fe with a mass of 54.997 amu, 84.65 % 56Fe with a mass of 55.989 amu

16) Distinguish between mass number, relative atomic mass, and average atomic mass.

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