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Learn: Atomic Structure and the Periodic Table
AQA GCSE Chemistry 8462 specification
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Welcome!Today we'll explore atomic structure and the periodic table. This is an exciting foundation for understanding chemistry!
What is Atomic Structure?Atomic structure refers to the arrangement of subatomic particles within an atom. Atoms consist of protons, neutrons, and electrons. These particles determine the properties of an element.
Subatomic ParticlesProtons have a positive charge and are found in the nucleus. Neutrons are neutral and also located in the nucleus. Electrons are negatively charged and orbit the nucleus in energy levels.
Which subatomic particle has a positive charge?
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What are Isotopes?Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. This means they have the same atomic number but different mass numbers.
An isotope has the same {{blank0}} number but different {{blank1}} number.
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Electronic ConfigurationsElectrons are arranged in energy levels. The first level can hold up to 2 electrons, while the second and third can hold up to 8 each. This arrangement determines the chemical properties of elements.
Match the items on the left with their correct pairs on the right
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The Periodic TableThe periodic table is a chart that organises elements by their atomic number, electron configurations, and properties. Elements in the same group have similar chemical properties.
What does the atomic number of an element represent?
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Development of the Periodic TableThe periodic table was first arranged by Dmitri Mendeleev, who organised elements by atomic mass and predicted missing elements. Later, it was refined to be based on atomic number.
Review Time!Great work! You've learned about atomic structure, isotopes, electronic configurations, and the periodic table. Let's test your understanding.
Which of the following are subatomic particles? (Select all that apply)
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Elements in the same group of the periodic table have similar {{blank0}} properties.
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Match the items on the left with their correct pairs on the right
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Who created the first version of the periodic table?
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