Isotopes

• Physics
• Secondary Education
• Age 13

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ISOTOPES

Understand that isotopes are the same kind of element but have different masses.

Learning Goal

September 17, 2025

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Self-survey

Reflection

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Starter

Pick and Match

Magnesium

Lithium

Potassium

Sodium

Barium

Calcium

Copper

Post-Lab Discussion

Post-Lab Discussion

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ISOTOPES

Understand that isotopes are the same kind of element but have different masses.

Learning Goal

September 17, 2025

_________ are different atoms of the same element with the same number of PROTONS but different number of NEUTRONS.

1. isobars
2. isotones
3. isotopes
4. isotonic solution

Isotopes of an element have the SAME chemical properties. Is it...

1. TRUE
2. FALSE

Isotopes of an element have the SAME chemical properties because______________.

1. Isotopes have the same electronic structures.
2. Isotopes have different electronic structures.
3. Isotopes have no electrons.

Isotopes of an element contain the same number of __________________ electrons.

1. outer shell
2. inner shell

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Class discussion

Isotopes

Writing names

Writing symbol notations

Drawing Bohr's model

Writing the electronic configuration

Calculating the Relative atomic mass (Ar)

Understanding isotopes

How do we write the names of isotopes?

Understanding isotopes

How do we write isotopic symbol notation?

Understanding isotopes

How do we write Bohr's models of isotopes?

Understanding isotopes

How do we write the Electronic configuration of isotopes?

Understanding isotopes

How do we calculate the Ar of elements?

Understanding isotopes

How do we calculate the Ar of elements?

Question:

Iridium has two isotopes. 

These isotopes are Iridium-191 and Iridium-193. A natural sample consists of 37.3% of Iridium-191. Calculate the A_r of the natural sample of Iridium.

Understanding isotopes

How do we calculate the Ar of elements?

Question:

Copper exists as a mixture of two isotopes. Copper-63 is 69.17% abundant, and it has a mass of 62.93 amu.

Copper-65 is 30.83% abundant, and it has a mass of 64.93 amu. Calculate the atomic mass of copper.

Understanding isotopes

How do we calculate the Ar of elements?

Question:

Calculate the atomic mass of silicon. The three silicon isotopes have atomic masses and relative abundances of

27.9769 amu (92.23%), 28.9765 amu (4.68%) and 29.9738 amu (3.09%). 

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Activity 1

Team discussion

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Team Activity

Work together to complete this task.

Use the A3 paper provided.

Tasks

• Write the isotope names.
• Write the symbol notations.
• Draw Bohr's models of the isotopes.
• Writing the electronic configurations of the isotopes.
• Calculating the Relative atomic mass (Ar)

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Presentation

Teaching others

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