S1.2 The Nuclear Atom (IB Chemistry)

Open Ended

Give a fact you already know about atoms.

Multiple Choice

What model of the atom was most recently developed?

• Bohr Model

• Quantum Model

• Chocolate Chip Cookie Model (Plum Pudding Model)

• Aristotelian theory of 4 elements

Activity

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

Home

Open in new tab

Copy link

Multiple Choice

A nucleon is a particle found in the nucleus. Based on this definition, which subatomic particles can be classified as nucleons? Record your answer in your workbook.

• Protons only

• Neutrons only

• Electrons only

• Protons and electrons

• Protons and Neutrons

Activity

​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

Draw

Using the data booklet, write the nuclear symbol for a neutral magnesium atom.

Draw

Using the data booklet, write the nuclear symbol for a magnesium ion formed when the magnesium atom loses 2 electrons.

Draw

Using the data booklet, write the nuclear symbol for a oxygen ion formed when an oxygen atom gains 2 electrons.

S1.2 THE NUCLEAR ATOM

​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.

Open Ended

Why is ³₂He not an isotope of ³₁H?

Home

Open in new tab

Copy link

Oxygen Isotopes & Paleoclimatology

Carbon isotopes for carbon dating

Uranium isotopes in nuclear power.

​EXTENSIONS

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

​Calculating Relative Atomic Masses

​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.

Home

Open in new tab

Copy link

Math Response

There are only two isotopes of copper: copper-63 and copper-65.

The relative atomic mass of copper is 63.55. Calculate the percentage of copper-63 in the naturally occurring element. Give your answer to two decimal places and do your working in the workbook.

Type answer here

Correct Answer: 72.50

Deg^°

Rad

HL Material