Question

Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?

Answer 1

Answer:

2,8,8 It is a noble gas as it have 8 electron in valence shell

Answer 2

The distribution of electrons in an atom of element whose atomic number is 18 is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ and special thing about the outermost electron shell (or valence shell) of the atom of this element is that it is completely filled and hence, it is more stable in nature.

Explanation:

• As it is given that atomic number of the element is 18 therefore, its electronic distribution is 2, 8, 8. As it is known that an element which have completely filled outermost shell are known as noble gases.

• These elements are not able to react further as they neither need to gain an electron or lose an electron. So, electronic configuration of element with atomic number 18 is as follows.

                  $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$

• Special thing about the outermost electron shell (or valence shell) of the atom of this element is that it is completely filled and hence, it is more stable in nature.

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