S1.2 The Nuclear Atom (IB Chemistry)

​Experiment with the "Atom" tab to complete the following table in your workbook.

​Experiment with the "Symbol" tab until you have figured out a formula for calculating each number & write them in your workbook.

​GAME: Play the game tab in Build an Atom until you have mastered all 4 games.

​Interpret the diagram below to write the nuclear symbols as indicated in your workbook.

When a question does not give us numbers of protons, neutrons or electrons, we can use the periodic table to write the symbol.

​Li

​7

​3

​0

​Round to a whole number

Assume it is a neutral atom

(p = e) unless otherwise stated

​Now you should understand...

Isotopes are atoms of the same element with a different number of neutrons. In other words, they have the same atomic number but different mass number.

​lithium-6

​lithium-7

​lithium-8

​Isotopes have the same chemical properties (undergo same reactions) because their electrons are the same.

​Isotopes have different physical properties because some are heavier than others. Heavier isotopes have higher density and slower effusion.

Use the above to complete your chart in your workbook.

Oxygen Isotopes & Paleoclimatology

Carbon isotopes for carbon dating

Uranium isotopes in nuclear power.

Search YouTube, Google or ask an AI Bot a question about these isotopes.

​Why do the masses in the periodic table have decimals?

Activity: Explore the "Isotopes" tab of the Isotopes and Atomic Mass PHET simulation on the next slide.

Use it to complete the calculation in your workbook.