Which noble gas does not follow the octet rule? a neon b argon c krypton d helium

The correct answer is d) helium.<br /><br />Helium is the noble gas that does not follow the octet rule. The octet rule states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with eight valence electrons. However, helium is an exception to this rule.<br /><br />Helium has only one electron shell, which can hold a maximum of two electrons. In its ground state, helium has two electrons in its only shell, filling the 1s orbital. This configuration is stable and does not require any additional electrons to achieve a full octet.<br /><br />Therefore, helium does not follow the octet rule and is the correct answer to the question.