Atomic Numbers Practice #1



Atomic Numbers Practice #1 Name __________________________________

Date ___________ Period __________

1) Define the following terms:

Atomic number:

Mass number:

Atomic Mass:

Isotope:

Isotope Symbol:

Nuclear Symbol:

2) Give the nuclear symbol for an atom with 9 protons and 10 neutrons: __________________

3) Give the nuclear symbol for an atom with atomic number 72 and 100 neutrons: _________________

4) Write an isotope symbol for an element with 20 protons and 21 neutrons: ___________________

5) Complete this chart for the following NEUTRAL atoms using your periodic table:

|Element |Atomic # |protons |electrons |neutrons |mass number |Isotope symbol |nuc. symbol |

|Si |14 | | |15 | | | |

|B | |5 | | |10 | | |

| | | |9 | |19 | | |

| |92 | | | |235 | | |

| | | | |48 |84 | | |

|U | | | |146 | | | |

| | | | | | | | Xe |

6) Which two of the above would be an example of isotopes?

7) Explain the difference between "atomic mass" and "mass number".

8) Complete this chart:

|Particle |charge |mass in amu |location in atom |Discovered by? |

|proton | | | | |

|neutron | | | | |

|electron | | | | |

Atomic Numbers Practice #2 Name __________________________________

Date ___________ Period __________

Definitions:

1) ___________________ Represents the number of protons in an atom’s nucleus.

2) ___________________ Atoms of the same element with different masses.

3) ___________________ Total of protons and neutrons in an atom.

4) ___________________ A weighted average of the different isotopic masses of an element’s atoms

5) ___________________ Subatomic particle with a mass of 1 AMU and a charge of +1

6) ___________________ Subatomic particle with a mass of 0 AMU and a charge of –1

7) Complete this chart for the following NEUTRAL atoms using your periodic table:

|Element |Nuc. symbol |Electrons |Protons |Neutrons |Isotope Symbol |Atomic Number |Mass Number |

|Xenon | | | | | | |133 |

|Iodine | | | |73 | | | |

| | | |50 |70 | | | |

| | | |79 | | | |200 |

| | | | | | |80 |200 |

| | |11 | |11 | | | |

| | | | | | | | |

8) Copper has 2 main isotopes, Cu-63 and Cu-65. Look up copper's atomic mass on the periodic table.

a) Which isotope, Cu-63 or Cu-65, is most abundant in nature?

b) Explain how you can tell.

9) Boron has 2 main isotopes, Boron-9 and Boron-10. Which isotope is more abundant in nature and how can you tell?

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