Atomic number and mass number
I can relate the atomic number and mass number to the structure of atoms of each element.
Atomic number and mass number
I can relate the atomic number and mass number to the structure of atoms of each element.
Lesson details
Key learning points
- The atomic number of an element states the number of protons in the nucleus of every atom of that element.
- The number of electrons in an atom is equal to the number of protons in the nucleus of the atom.
- The mass number of an element is about equal to the number of protons and neutrons in atoms of that element.
Common misconception
Pupils often mix up the atomic number and atomic mass number and get confused over which subatomic particles these represent.
It helps to describe the atomic number as the proton number to help the pupils remember. Also, the provided periodic tables often have a key to help and this should be highlight to pupils.
Keywords
Atomic number - The number of protons in the nucleus of an atom, which determines the element's identity.
Mass number - The total number of protons and neutrons in the nucleus of an atom.
Relative atomic mass - The mean mass of an atom relative to 1/12th of the mass of a carbon-12 atom.
Equipment
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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Starter quiz
6 Questions
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