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Learning Outcomes
At the end of this lesson, you should be able to:
- Describe the structure of the atom as a central nucleus containing neutrons and protons surrounded by electrons in shells
- State the relative charges and relative masses of a proton, a neutron and an electron
- Define proton number/atomic number as the number of protons in the nucleus of an atom
- Define mass number/nucleon number as the total number of protons and neutrons in the nucleus of an atom
- Determine the electronic configuration of elements and their ions with proton numbers 1 to 20, e.g. 2,8,3
- State that:
(a) Group VIII noble gases have a full outer shell
(b) the number of outer shell electrons is equal to the group number in Groups I to VII
(c) the number of occupied electron shells is equal to the period number