Chemistry, asked by graceluhan8464, 1 year ago

• in which of the group 18 elements, 8 electrons in the outermost shell is not present

Answers

Answered by geet2487
0

Helium.

Reason: it has atomic number 2 and so has 2 electrons in its first and only shell.

It is placed in group 18 as it has closed shell i.e. completely filled valence shell configuration.

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