Correct Answer: 2
Subject: chemistry
Explanation: • <b>Key Fact</b> A hydrogen atom has 1 electron. A hydrogen molecule (H₂) forms when 2 atoms share their electrons. • <b>Supporting Detail</b> Sharing electrons results in 2 electrons in the combined K shell of the H₂ molecule. • <b>Related Concept</b> The K shell holds a maximum of 2 electrons. Thus, H₂ achieves a stable "duplet" configuration. • <b>Why wrong options are wrong</b> Option A is for a single H atom, not a molecule. Options C and D exceed K-shell capacity. • <b>Exam Trick</b> Read carefully: Atom = 1 electron; Molecule = 2 electrons. • <b>Additional Info</b> The two hydrogen atoms are joined by a single covalent bond.
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