Describe how the model of the atom has changed over the years, and how it continues to do so....
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Transcript of Describe how the model of the atom has changed over the years, and how it continues to do so....
• Describe how the model of the atom has changed over the years, and how it continues to do so.
• Understand that scientific knowledge is always evolving.
• Describe how new theories are accepted by scientists.
Week 1
© Pearson Education Ltd 2008This document may have been altered from the original
Rutherford’s gold-leaf experiment
Week 1
© Pearson Education Ltd 2008This document may have been altered from the original
• Describe protons, neutrons and electrons.
• Describe the distribution of mass and charge in an atom.
• Describe the contribution of protons and neutrons to the nucleus in terms of atomic number and mass number.
• Explain the term isotopes.
• Deduce the atomic structure in atoms and ions.
Week 1
© Pearson Education Ltd 2008This document may have been altered from the original
An isotope of beryllium
Week 1
© Pearson Education Ltd 2008This document may have been altered from the original
Week 1
© Pearson Education Ltd 2008This document may have been altered from the original
Symbol for an isotope
• Explain why 12C is used as the standard measurement of relative mass.
• Define the terms relative isotopic mass and relative atomic mass.
• Calculate relative atomic masses.
• Work out relative molecular masses and relative formula masses.
Week 1
© Pearson Education Ltd 2008This document may have been altered from the original
Carbon-12: the standard for measuring atomic masses
Week 1
© Pearson Education Ltd 2008This document may have been altered from the original