Atomic Math Challenge - Mr. Fischer



Name:

Isotope Practice Worksheet

1. Here are three isotopes of an element: 612C 613C 614C

a. The element is: _______carbon___________

b. The number 6 refers to the __________protons_______________

c. The numbers 12, 13, and 14 refer to the _______mass_________________

d. How many protons and neutrons are in the first isotope? _____p=6 n=6____________

e. How many protons and neutrons are in the second isotope? ____p=6 n=7___________

f. How many protons and neutrons are in the third isotope? ______p=6 n=8___________

2. Complete the following chart:

|Isotope name |atomic # |mass # |# of protons |# of neutrons |# of electrons |

|92 uranium-235 |  92 |  235 |  92 |  143 |  92 |

|92 uranium-238 |  92 |  238 | 92  | 146  | 92  |

|5 boron-10 |  5 | 10  |  5 | 5  |  5 |

|5 boron-11 |  5 |  11 |  5 |  6 |  5 |

3. Naturally occurring europium (Eu) consists of two isotopes with a mass of 151 g and 153 g. Europium-151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%. What is the atomic mass of europium? Show all work.

151(0.4803) + 153(0.5197) = 152.0394

4. Strontium (Sr) consists of four isotopes with masses of 84 g (abundance 0.50%), 86 g (abundance of 9.9%), 87 g (abundance of 7.0%), and 88 g (abundance of 82.6%). Calculate the atomic mass of strontium. Show all work.

84(0.0050) + 86(0.099) + 87(0.07) + 88(0.826) = 87.712

5. Find the average atomic mass of Silver (Ag) if 51.83% of the silver atoms occurring in nature have mass 106.905 g and 48.17% of the atoms have mass 108.905 g. Show all work.

106.905(0.5183) + 108.905 (0.4817) = 107.8684

Atomic Math Name________________Per_____

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3

Li

Lithium

6.941

(____protons________

(_____symbol_______

(_____name________

(______mass__________

Atomic number equals

The number of

__protons__ or__electrons___

Atomic mass equals

The number of

__protons___ + ____neutrons___

19

_K_

Potassium

39.098

Atomic # = __3__

Mass # = _39.098____

# Protons = ___19__

# Neutrons = _20____

# electrons = __19___

_3_

Li

Lithium

_6.94_

Atomic # = _3__

Mass # = __6.94__

# Protons = ___3__

# Neutrons = ___4___

# electrons = __3___

16

S

_Sulfur_

32.06

Atomic # = ___16___

Mass # = __32.06__

# Protons = __16___

# Neutrons = ___16___

# electrons = ___16__

_5_

_B_

Boron

__10.81__

Atomic # = __5__

Mass # = ___10.81__

# Protons = __5__

# Neutrons = __6____

# electrons = __5___

_17__

Cl

_Chlorine_

_35.45_

Atomic # = ___17____

Mass # = _35.45______

# Protons = __17_____

# Neutrons = __18____

# electrons = _17___

14

Si

_Silicon_

_28.09_

Atomic # = ___14____

Mass # = ____28.09___

# Protons = __14___

# Neutrons = __14____

# electrons = _14____

_1_

__H__

_Hydrogen

1.01

Atomic # = ___1_____

Mass # = ____1.01____

# Protons = ____1____

# Neutrons = __0_____

# electrons = __1____

11

_Na_

_Sodium_

_22.99_

Atomic # = __11___

Mass # = __22.99_____

# Protons = ___11____

# Neutrons = __12___

# electrons = __11__

_27_

_Co__

_Cobalt_

58.93

Atomic # = __27_____

Mass # = __58.93_____

# Protons = ___27____

# Neutrons = ___32___

# electrons = __27__

_56__

_Ba__

__Barium_

137.33

Atomic # = __56_____

Mass # = _137.33____

# Protons = ____56___

# Neutrons _81______

# electrons = _56____

_9_

__F__

_Flourine_

19.00

Atomic # = ____9___

Mass # = _____19.00__

# Protons = _____9___

# Neutrons = __10____

# electrons =___9____

_39_

__Y__

_Yttrium__

88.91

Atomic # = ____39___

Mass # = ___88.91____

# Protons = ____39___

# Neutrons = ___50___

# electrons = ___39__

86

_Ru_

__Radon__

__222___

Atomic # = _86______

Mass # = __222______

# Protons = _86______

# Neutrons =_136____

# electrons = _86___

_92_

_U_

_Uranium_

238.05

Atomic # = __92_____

Mass # = __238.05____

# Protons = __92_____

# Neutrons = _146____

# electrons = __92__

__79_

_Au_

___Gold__

196.97

Atomic # = _79_____

Mass # = ___196.97___

# Protons = ___79____

# Neutrons = __118___

# electrons = _79___

15

_P_

Phosphorous

__30.97___

Atomic # = _15_____

Mass # = __30.97_____

# Protons = 15_______

# Neutrons = __16____

# electrons = 15_____

_53_

_I_

Iodine

__126.70__

Atomic # = ___53____

Mass # = 126.90______

# Protons = __53____

# Neutrons = __74____

# electrons = __53___

__80_

Hg

Mercury

_200.59_

Atomic # = ___80___

Mass # = 200.59______

# Protons = __80_____

# Neutrons = __121___

# electrons = _80___

__50_

_Sn_

Tin

118.71

Atomic # = __50_____

Mass # = 118.71______

# Protons = __50____

# Neutrons = __69___

# electrons = _50___

__74_

_W_

Tungsten

__183.84__

Atomic # = __74_____

Mass # =183.84_____

# Protons = ___74____

# Neutrons = _110____

# electrons = __74___

3

Li

Lithium

6.941

Atomic # = __________________

Atomic Mass = _______________

# of Protons = _______________

# of Neutrons = ______________

# of electrons = ______________

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