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Questions and Answers
What is atomic theory?
What is atomic theory?
Where are protons located?
Where are protons located?
Inside the nucleus
What is the charge of a proton?
What is the charge of a proton?
Positively charged
What is the symbol for a proton?
What is the symbol for a proton?
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Where are neutrons located?
Where are neutrons located?
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What is the charge of a neutron?
What is the charge of a neutron?
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What is the symbol for a neutron?
What is the symbol for a neutron?
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Where are electrons located?
Where are electrons located?
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What is the charge of an electron?
What is the charge of an electron?
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What is the mass of an electron compared to protons and neutrons?
What is the mass of an electron compared to protons and neutrons?
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What is the atomic number?
What is the atomic number?
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What does the mass number represent?
What does the mass number represent?
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What units is mass measured in?
What units is mass measured in?
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The number of protons in an atom must equal the _____
The number of protons in an atom must equal the _____
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Study Notes
Atomic Theory
- Atoms are the smallest units of matter and are fundamental building blocks of all substances.
Protons
- Protons are located in the nucleus of the atom.
- They carry a positive charge, denoted as p+.
- Each proton has a mass of approximately 1 atomic mass unit (amu).
Neutrons
- Neutrons are also found in the nucleus.
- They possess no electric charge, making them neutral, denoted as n.
- The mass of a neutron is around 1 amu, similar to protons.
Electrons
- Electrons orbit the nucleus and are much smaller than protons and neutrons.
- They are considered virtually weightless and carry a negative charge, represented as e-.
Atomic Number
- The atomic number identifies an element and is defined as the total number of protons in the nucleus.
- Each element has a unique atomic number that distinguishes it from other elements.
Mass Number (Atomic Mass)
- The mass number is the sum of protons and neutrons in an atom.
- It is measured in atomic mass units (amu), providing a way to gauge the total mass of an atom.
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Description
Test your knowledge of atomic structure with these flashcards designed for Grade 9 Chemistry. Explore key terms like atomic theory, protons, neutrons, and electrons to enhance your understanding of matter. Perfect for quick revision before exams!
