Objectives: Many children are exposed to their peers being bullied, which negatively impacts individuals and the society as a whole. We investigated the effects of elementary school children's emotional empathy and social problem-solving skills on their defending behaviors. We evaluated the direct and indirect effects of these personal characteristics, mediated through their perceived peer acceptance among classmates. Gender differences were also tested.Methods: The study participants were 386

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... ourth- and fifth-graders (M = 10.4 yrs.) from six elementary schools in the metropolitan Seoul area of South Korea. Children's perceived social acceptance, emotional empathy, and problem-solving skills were measured using self-reported questionnaires. Defending behavior was measured using peer nomination. To analyze the data, descriptive statistics and structural equation modeling were conducted using SPSS 21.0 and MPLUS 6.12.Results: Bystanders' emotional empathy and social problem-solving skills had significant effects on defending behaviors. Social problem-solving skills directly affected defending behaviors of boys and girls. Girls' peer acceptance mediated both emotional empathy and social problem-solving skills for defending behaviors, while no mediation effect was found in boys.Conclusion: For children, feeling accepted by classmates is important for defending bullied peers. For girls, peer acceptance magnifies their socio-emotional and socio-cognitive skills, empowering them to defend the bullied peers. However, for boys, having competent socio-cognitive skills alone is sufficient. Based on this study's findings, it is recommended that interventions are needed to enhance bystanders' emotional empathy and social problem-solving skills, and thereby, empowering them to be competent defenders against school bullying.