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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 break it down step by step to help you understand the building blocks of atoms and their properties.
What is Atomic Structure?Atomic structure refers to the arrangement of particles (protons, neutrons, electrons) within an atom. Understanding this helps explain properties like mass and charge.
Protons, Neutrons, and ElectronsProtons are positively charged particles found in the nucleus. Neutrons have no charge (neutral) and are also in the nucleus. Electrons are negatively charged and orbit the nucleus in energy levels.
Quick check: Which particle has a positive charge?
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Atomic Number and Mass NumberAtomic number represents the number of protons in an atom. It defines the element. Mass number is the total number of protons and neutrons, giving the atom's mass.
Which of these statements are true? (Select all that apply)
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IsotopesIsotopes are atoms of the same element with the same number of protons but different numbers of neutrons. This changes the mass number but not chemical properties.
Time-of-Flight (TOF) Mass SpectrometryThis method measures the mass-to-charge ratio of ions. Ions are accelerated, and their time of flight is recorded to calculate mass.
Quick check: What does TOF mass spectrometry measure?
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Mass Spectra InterpretationA mass spectrum shows peaks representing ions. The x-axis gives the mass-to-charge ratio, and the y-axis shows abundance.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You've learned about atomic structure, including particles, isotopes, and mass spectrometry. Let's test your understanding with a few questions.
Which of the following are found in the nucleus of an atom? (Select all that apply)
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What happens to ions in TOF mass spectrometry?
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Isotopes have the same number of {{blank0}} but different numbers of {{blank1}}.
Start the lesson to answer this fill in the blank question
Match the items on the left with their correct pairs on the right
Start the lesson to answer this math equation question
Well done!You've completed the lesson on atomic structure. Keep practising to strengthen your understanding. Great job!
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