Which one of the following is most likely to lose electrons when forming an ion?
A) Na
B) O
C) F
D) Ne
E) N

The element that has been most likely to form an ion by losing electrons has been Na. Thus, option A is correct.

The bonds have been formed with the gain and loss of the valence electrons that has been responsible for completing the electronic configuration. The metals have the tendency to lose electrons, while nonmetals have the tendency to gain electrons.

The element with the least number of valence electrons has found it easy to lose the electron and attain the stable noble gas configuration. The Na has been the element of Group 1, having 1 valence electron. The loss of electrons results in a stable configuration.

Thus, the element that has been most likely to form an ion by losing electrons has been Na. Thus, option A is correct.

For more information about loss of electrons, refer to the link:

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Option A) Na

Explanation:

From the options given above, sodium (Na) is most likely to lose electron to form ion

Na is a group 1 metal. Metals form ions by losing electron(s).

From the options given above, only Na is a metal and so it is most likely to form ion by losing electron

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