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Learn: Atomic Structure
AQA Chemistry 7405
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Welcome!Today we'll explore Atomic Structure, a key topic in AQA Chemistry 7405. We'll learn about atomic numbers, isotopes, and mass spectrometry. Let's dive in!
What is Atomic Structure?Atomic structure refers to the arrangement of protons, neutrons, and electrons in an atom. It helps us understand the properties and behaviour of elements.
Atomic Number and Mass NumberThe atomic number is the number of protons in an atom, which determines the element. The mass number is the sum of protons and neutrons in the nucleus.
Quick check: What does the atomic number represent?
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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.
Isotopes of an element have the same {{blank0}} but different {{blank1}}.
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What is TOF Mass Spectrometry?Time-of-flight (TOF) mass spectrometry is a technique used to measure the mass of ions. It works by ionising the sample, accelerating the ions, and measuring their flight time to calculate their mass.
Match the items on the left with their correct pairs on the right
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Interpreting Mass SpectraA mass spectrum shows the relative abundance of ions plotted against their mass-to-charge ratio (m/z). Peaks indicate the presence of isotopes or molecules.
What does the height of a peak in a mass spectrum represent?
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Review Time!Great work! You've learned about atomic structure, isotopes, and mass spectrometry. Let's review these concepts with some questions.
Which of the following statements are true about isotopes? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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In mass spectrometry, ions are accelerated by an {{blank0}} field and detected based on their {{blank1}} ratio.
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