Question

What is an octet? How do elements reach an octet?

Answer 1

The possessing of 8 electrons in the outermost shell for making the shell fully filled is called as octet. If an atom possess an octet then it becomes stable. Atoms reach an octet by sharing and gaining electrons.
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Answer 2

octet is the condition of an element in which they stable electronic configuration by having 8 electrons in their outermost shell.
elements reach an octet by either giving or taking or by sharing electrons