How to make a Bohr
model!
You can do it!
• Choose an element
• Look at the atomic number: that tells you the
number of protons and electrons
• Look at the atomic mass and then round it to
the nearest whole number. Now you have the
mass number
• Subtract the atomic number from the mass
number. Now you have the number of
neutrons.
• At the top of your paper write:
MY BOHR MODEL OF ( write the name of the element you’re doing)
• Make a key in the corner. Label it: KEY
• Write the word protons, then a +, and then
the number of protons your element has.
(look at the atomic number)
• Write the word electrons, then a -, and then
the number of electrons your element has.
(look at the atomic number)
• Write the word neutrons, then a 0 and the
number of neutrons your element has. (subtract the
atomic number from the mass number)
• In the center of your paper draw the number
of + you need to have the correct number of
protons.
• In between the + protons, draw the 0’s to
represent the correct number of neutrons you
need.
• Look in the upper right corner of the element
box at the electron numbers.
• Draw the correct number of rings around the
nucleus.
• On the ring closest to the nucleus, make the
correct number of – signs for the electrons. (this
is the top number in the list; probably 2)
• On the next ring, make the correct number of
– signs for the electrons.
• Continue until you have the correct number of
electrons on each ring.
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Double Check!
Count the protons. Does it match the atomic
number?
Count the electrons. Does it match the atomic
number?
Count the neutrons. Add that number to the
number of protons. Does that match the mass
number?
Do you have protons + and neutrons 0 in the
nucleus?
Are electrons – on the rings around the nucleus?
YOU DID IT!!!
You just made a Bohr model!
Excellent work!
Yay!