New Hampshire NH SAS Science - High School Practice Questions - New Hampshire Statewide Assessment System Science - High School (Second Year Of High School) Exam

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Which statement best explains why sodium (Na, group 1) and chlorine (Cl, group 17) form the ionic compound NaCl with a 1:1 ratio rather than covalent molecules?

Sodium readily donates one electron and chlorine readily accepts one electron, giving both a filled outer shell. Sodium and chlorine share a pair of valence electrons equally between the two atoms. Sodium accepts seven electrons from chlorine to complete its outer shell. Both atoms have equal electronegativity, so neither attracts the bonding electrons more strongly.

Correct Answer:

Sodium readily donates one electron and chlorine readily accepts one electron, giving both a filled outer shell.

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