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BOHR'S MODEL_S

Sarah Reichard

Created on October 7, 2025

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Transcript

THE BOHR's ATOMIC model DIAGRAM

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Objective:

Identify and use previous knowledge to arrange electrons in orbitals using Borh's model.

skills:

Combine knowledge, understanding and skills to create products or solutions

Transfer skills:

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How are electrons placed?

  • The first shell (orbit) can hold up to 2 electrons
  • The second can hold up to 8 electrons
  • The third shell can hold up to 18 electrons (usually only contains 8 electrons - These are the ones we will work with)
  • The fourth, fifth, sixth and seventh shell can hold up to 32 electrons

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Bohr's Model

  • Complete model
  • Compact model

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Bohr's Model

Complete and compact model

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Steps to draw the Bohr's diagram

1. Find the element on the periodic table. 2. Determine the number of protons from the atomic number 3. In a neutral atom (an atom with no overall charge #Electrons = #Protons

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Example: Carbon:

Steps to draw the Bohr's diagram

4. Determine what goes in the nucleus (the number of Protons and Neutrons) 5. Write the number of protons and neutrons for the atom inside the nucleus

C P = 6 N = 6

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Steps to draw the Bohr's diagram

4. Determine the electron configuration.

  • This chart show the maximum number of electrons in each energy level.
  • For our the first 20 elements, the third energy level will only hold 8 electrons

8/18

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Steps to draw the Bohr's diagram

6. Draw the number of shells or orbitals according to the electron configuration

In a neutral atom, the # of p+ = # of e- This atom has 6 p+ so it must have 6 e- to be neutral. To fit all 6 e- the atom will have 2 electron shells.

C P = 6 N = 6

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Steps to draw the Bohr's diagram

8. Write down the number of electrons in each shell.

1º shell= 2 electrons 2º shell= 4 electrons

Complete

C P = 6 N = 6

Compact

C- 2 . 4

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Remember: Valence electron

Valence electrons

Is an outer shell electron that can participate in the formation of a chemical bonds.

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What are the valence electrons for Carbon?

Carbon has 6 TOTAL electrons. Only 4 of them are in the outermost electron shell. These outer 4 are the VALENCE ELECTRONS

C P = 6 N = 6

2 4

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Example: Let's draw the Bohr's diagram for Chlorine

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Example: Solution: Bohr's diagram for Chlorine

1º shell= 2 electrons 2º shell= 8 electrons 3º shell= 7 electrons

Cl P = 17 N = 18

2 8 7

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Example: What are the valence electrons for Chlorine?

HINT: How many electrons are in the outermost electron shell?

Cl P = 17 N = 18

2 8 7

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#1 Let's draw the Bohr's diagram for Beryllium

P =____

Remember, Protons = the atomic number

#1 Let's draw the Bohr's diagram for Beryllium

P = 4 N = ____

Atomic Mass (rounded) - Atomic number Number of neutrons

#1 Let's draw the Bohr's diagram for Beryllium

P = 4 N = 5

Remember, electrons = the number of protons

#1 Let's draw the Bohr's diagram for Beryllium

P = 4 N = 5

#1 Let's draw the Bohr's diagram for Beryllium

P = 4 N = 5

#1 Let's draw the Bohr's diagram for Beryllium

P = 4 N = 5

#1 Let's draw the Bohr's diagram for Beryllium

P = 4 N = 5

#1 Let's draw the Bohr's diagram for Beryllium

P = 4 N = 5

Remember, valence electrons are the OUTER electrons

#2 Let's draw the Bohr's diagram for Fluorine

P =____

Remember, Protons = the atomic number

#2 Let's draw the Bohr's diagram for Fluorine

P = 9 N = ____

Atomic Mass (rounded) - Atomic number Number of neutrons

#2 Let's draw the Bohr's diagram for Fluorine

P = 9 N = 10

Remember, electrons = the number of protons

#2 Let's draw the Bohr's diagram for Fluorine

P = 9 N = 10

#2 Let's draw the Bohr's diagram for Fluorine

P = 9 N = 10

#2 Let's draw the Bohr's diagram for Fluorine

P = 9 N = 10

#2 Let's draw the Bohr's diagram for Fluorine

P = 9 N = 10

#2 Let's draw the Bohr's diagram for Fluorine

P = 9 N = 10

Remember, valence electrons are the OUTER electrons

#3 Let's draw the Bohr's diagram for Phosphorus

P =____

Remember, Protons = the atomic number

#3 Let's draw the Bohr's diagram for Phosphorus

P = 15 N = ____

Atomic Mass (rounded) - Atomic number Number of neutrons

#3 Let's draw the Bohr's diagram for Phosphorus

P = 15 N = 16

Remember, electrons = the number of protons

#3 Let's draw the Bohr's diagram for Phosphorus

P = 15 N = 16

#3 Let's draw the Bohr's diagram for Phosphorus

P = 15 N = 16

#3 Let's draw the Bohr's diagram for Phosphorus

P = 15 N = 16

#3 Let's draw the Bohr's diagram for Phosphorus

P = 15 N = 16

#3 Let's draw the Bohr's diagram for Phosphorus

P = 15 N = 16

Remember, valence electrons are the OUTER electrons

#5 How many valence electrons?

Remember, valence electrons are the OUTER electrons

#4 How many valence electrons?

Remember, valence electrons are the OUTER electrons

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