Question

why are no lone pairs shown in the ch₄ molecule? all 4 of its valence electrons are involved in a bond with hydrogen. the option to show lone pairs was left unchecked. the lone pairs are absorbed into the bonds with hydrogen. carbon has no valence electrons and cannot make a lone pair.

Explanation:

Carbon has 4 valence electrons. In \(CH_4\), each of these 4 valence electrons forms a covalent bond with a hydrogen atom (since hydrogen has 1 valence electron and needs one more to complete its shell). A lone pair is a pair of valence electrons that are not involved in bonding. Since all 4 of carbon's valence electrons are used in bonding with hydrogen, there are no remaining valence electrons to form lone pairs.

• The option "The option to show lone pairs was left unchecked" is incorrect because it's a scientific fact about electron - pair usage, not a display setting.
• "The lone pairs are absorbed into the bonds with hydrogen" is not a valid scientific concept. Bonds and lone pairs are distinct in terms of electron - pair behavior (bonding pairs are shared between atoms, lone pairs are localized on an atom).
• "Carbon has no valence electrons and cannot make a lone pair" is wrong because carbon has 4 valence electrons (from the \(2s^22p^2\) configuration in its valence shell).

Answer:

All 4 of its valence electrons are involved in a bond with hydrogen.