Atoms and Bohr Models

Isotopes, The Periodic Table and Bohr Models

What are Isotopes?

• Isotopes are atoms with the same number of protons and electrons, but a different number of neutrons

• Isotopes have the same atomic number, but different mass number.

Labeling

Determine the mass number and number of neutrons for both these isotopes of Carbon.

Drag labels to their correct position on the image

6

12

14

8

20

18

•The mass number comes after the name of the element. For example:

Hyphenated Form

​Nuclide Symbols

Writing Isotope Names

Hyphenated Form

​Nuclide Symbol

An atom of potassium has an atomic number of 19 and mass number of 40. Write this isotope in nuclide and hyphenated form.

Match

Match the following isotope names to the atoms.

Helium-4

Helium-5

Helium-6

• Helium-4

• Helium-5

• Helium-6

Multiple Choice

Which of the following is the correct Nuclide Symbol for the atom?

Protons are red, neutrons are grey, and electrons are blue.

Draw

Complete the nuclide symbol for lithium, based on the atom given.

The Periodic Table and Bohr Models

Drag and Drop

Nitrogen has an atomic number of ​

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.

Nitrogen has a symbol of ​

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Nitrogen has a mass number of ​

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​

Drag these tiles and drop them in the correct blank above

seven

N

14

15

14.007

• The columns of the Periodic Table

• The column number shows the number of outer-shell (valence) electrons

​Groups

• The rows of the Periodic Table

• The period number shows the number of electron shells

Periods

Periods and Groups

Drag and Drop

Boron has ​

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electron shells. It also has ​

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electrons in its outer shell. The outer-shell electrons are also known as ​

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.

Drag these tiles and drop them in the correct blank above

two

three

valence electrons

valour electrons

Drawing Bohr Models

• Draw the nucleus as a circle in the centre.

• List the number of protons and neutrons inside the circle.

• Draw electron shells around the nucleus.

  • 1st Shell - 2 Electrons

  • 2nd Shell - 8 Electrons

  • 3rd Shell - 8 Electrons

​Lithium Bohr Model

Match

Match the Following Bohr Models to the Correct Element

Helium

Carbon

Oxygen

• Helium

• Carbon

• Oxygen

Draw

Draw a Bohr Model of Fluorine