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# Bohr diagrams

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### Transcript of "Bohr diagrams"

1. 1. Parts of an Atom, What a BOHR…. Learning to draw Bohr diagrams.
2. 2. Atomic Number  Typically located above the element’s symbol.  As the table progresses from left to right, and top to bottom, the atomic number of the elements increases by one for each element.  This number tells us how many protons there are in the nucleus of each element.
3. 3. What is the atomic number for Carbon? 6 C 12.011
4. 4. How many protons does Carbon have? (think of it’s atomic #) 6 C 12.011
5. 5. How do we determine the number of neutrons? Round: 12.001= 12 1. Round the atomic mass 2. Subtract the Atomic number from the atomic mass. 6 C 12.011 Subtract: 12-6= 6 ANSWER: 6 protons and 6 neutrons!
6. 6. What about the number of electrons?? We know that an atom is neutral overall. Electrons are negative… protons are positive… 6 C 12.011 How many electrons do we need to cancel out the positivity of the protons? You guessed it! The same as the number of protons!
7. 7. Let’s try it with another element: 10 Ne 20.180 Ne (Neon): Atomic number? Number of Protons? Atomic mass? Number of neutrons? Number of electrons?
8. 8. Time for Bohr Diagrams!  Remember the sequence 2,8,8?!?!  This is when we need it!  Hold onto your hats folks! This is exciting!
9. 9. Three easy steps to making a Bohr diagram: Determine the number of protons, neutrons and electrons. 2. Write the number of protons and neutrons in the center. 3. Draw the electrons in the shells around the nucleus following the sequence 2,8,8. (they need to be in pairs, drawn one at a time) 1.
10. 10. Let’s try it all together!
11. 11. Helium: Atomic# 2, Atomic Mass 4 amu 2+ 2n Protons = 2 Neutrons = 2 Electrons = 2
12. 12. Lithium: Atomic# 3 Atomic mass 6.9 amu 3+ 4n Protons = 3 Neutrons = 4 Electrons = 3
13. 13. Magnesium: atomic# 12, mass 24amu 12+ 12n Protons = 12 Neutrons = 12 Electrons = 12
14. 14. That wasn’t too hard, was it?? Now it’s time for you to practice!
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