Basic Atomic Structure Worksheet
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1
2Basic Atomic Structure Worksheet
1. The 3 particles of the atom are:
a. ________________________
b. ________________________
c. ________________________
Their respective charges are:
a. ________________________
b. ________________________
c. ________________________
2. The number of protons in one atom of an element determines the atom’s ____________________, and the
number of electrons determines the _________________________ of the element.
3. The atomic number tells you the number of ___________________________ in one atom of an element. It also
tells you the number of __________________________ in a neutral atom of that element. The atomic number
gives the “identity” of an element as well as its location on the periodic table. No two different elements will
have the ____________________ atomic number.
4. The ______________________ of an element is the average mass of an element’s naturally occurring atom, or
isotopes, taking into account the ____________________ of each isotope.
5. The _______________________ of an element is the total number of protons and neutrons in the
___________________ of the atom.
6. The mass number is used to calculate the number of ______________________ in one atom of an element. In
order to calculate the number of neutrons you must subtract the ______________________ from the
______________________.
7. Give the symbol of and the number of protons in one atom of:
Lithium _____________________________
Bromine _____________________________
Iron
_____________________________
Copper
_____________________________
Oxygen _____________________________
Mercury _____________________________
Krypton _____________________________
Helium
_____________________________
8. Give the symbol of and the number of electrons in a neutral atom of:
Uranium _____________________________
Iodine
_____________________________
Boron
_____________________________
Xenon
_____________________________
Chlorine _____________________________
9. Give the symbol of and the number of neutrons in one atom of:
(Mass numbers are ALWAYS whole numbers…show your calculations)
Barium
______________________________
Bismuth _____________________________
Carbon
______________________________
Hydrogen _____________________________
Fluorine ______________________________
Magnesium____________________________
Europium ______________________________
Mercury _____________________________
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