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1. Li<Be<C<O<F On moving from right to left in a period, the non-metallic character decreases (metallic character increases), as the atomic size increases and the force of attraction between the nucleus and the outermost electron decreases.
2. Atomic weight increases from Be to Ba in a group and volume also increases, but increase in atomic weight is more as compare to atomic volume. Therefore the density increases from Be to Ba. Exception: The density of Mg is more as compared to that of Ca. Order: Ca < Mg < Be < Sr < Ba.
3. Li, Na, K, Rb, Cs are IA group elements from Li to Rb the electronegativity will be decreased. So, the correct order of electronegativity is C s < Rb = K < N a < Li.
5. Electron Affinity (decreases down the group) Since the atomic size increases down the group, electron affinity generally decreases. But the C l has more electron affinity than F. Hence, the correct order of increasing electron affinity is I < Br < F < C l.
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