Name ____________________________

ATOMIC STRUCTURE LAB

Astronomy 101

Before drawing each picture, fill in the blanks.  For each picture that you draw, use a circled P to represent a proton, a circled N to represent a neutron, and a circled e to represent an electron.

1.      Draw a neutral helium-4 atom.

# of protons ______________ 

(Hint: How many protons does helium always have?)

# of neutrons ______________   

(Hint:  How does the number 4 determine the number of neutrons?)

# of electrons ______________  

(Hint:  For a neutral atom, how does the number of electrons compare to the number of protons?)

2.       Draw a singly-ionized helium-4 atom.

# of protons ______________  

# of neutrons ______________   

# of electrons ______________  

(Hint:  How does single ionization affect the number of electrons?)

3.       Draw a singly-ionized tritium atom.  (Hint:  Tritium is a nickname for what element?)

# of protons ______________  

# of neutrons ______________

# of electrons ______________  

4.       Draw a triply-ionized oxygen-15 atom.

# of protons ______________

# of neutrons ______________ 

# of electrons ______________ 

5.  Identify the type of atom that has 28 protons, 32 neutrons and 26 electrons.

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