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Ionic bonding decreases across a period as electronegativity increases. F (group 17, electronegativity 4.0) prefers covalent bonds, unlike Li, Be, or B.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
Ionic bond is the accurate classification or categorization for the organism, molecule, or concept described in this question. In Chemical Bonding, proper classification is based on shared characteristics including morphological, biochemical, genetic, and evolutionary criteria. Ionic bond meets the specific diagnostic features and defining criteria that distinguish it from related groups. The other options (Covalent bond, Metallic bond, and Hydrogen bond) belong to different taxonomic groups, represent different classification levels, or possess distinct characteristics that exclude them from
Ref: Campbell Biology, Urry et al., 12th Ed.
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