How to make a Bohr model!

1. How to make a Bohr model! You can do it!

2. 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.

3. 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)

4. 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.

5. 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.

6. 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?

7. YOU DID IT!!! You just made a Bohr model! Excellent work! Yay!