Chemistry
Grade-9
Easy

Question

How many shells are present in potassium?

  1. 4
  2. 3
  3. 2
  4. 19

hintHint:

19 electrons to be arranged in electron shells.

The correct answer is: 4


    • Potassium has 19 electrons to be arranged in shells.
    • First shell has two electrons, second shell has eight electrons, third shell has eight electrons followed by one electron in fourth shell.
    • Hence, there are four shells in potassium.

    The region surrounding a nucleus, known as an electron shell, is where electrons are typically located.
    ¶1s, 2s, 2p, 3s, 3d, 4p, 5s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, and 8s are the numbers in order. Although it is difficult to remember, there is a simple approach. Move from top to bottom, top right end to the bottom left of each line, in the order of the lines.
    ¶The lowest accessible shell nearest to the nucleus must be occupied by electrons.
    ¶The most electrons that can fit into each shell are:
    ¶There were two in the first shell, eight in the next, and eight in the last.
    The twenty-first element, calcium, has two more electrons in the fourth shell.

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