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10 January, 20:38

Potassium has an atomic number of 19. What is its electron configuration?

shells 1 and 2 are full, and shell 3 has nine electrons

shells 1, 2 and 3 are full and shell 4 has three electrons

shells 1, 2 and 3 are full and shell 4 has one electron

shells 1, 2 and 3 are full and no other electrons are present

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  1. 10 January, 21:04
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    shells 1, 2 and 3 are full and shell 4 has one electron

    Explanation:

    The distribution fo the electrons possessed by an atom in the shells surrounding it is termed as its electronic configuration.

    According to the rules of writing the electronic configuration:

    1. The first shell can be occupied by a maximum of two electrons.

    2. the subsequent shells can be occupied by a maximum of 8 electrons.

    3. the subsequent shells are filled only once the lower shells have been filled.

    Based on these rules, the electronic configuration of potassium should be 2, 8, 8, 1. (2+8+8+1 = 19).

    Thus, we can see that the first three shells are filled, and the last one has one electron left.
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