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1. The same is true for the two outermost electrons in beryllium, they are screened by two core electrons. However, beryllium has 4 protons in its nucleus, as opposed to 3 protons which are present in the nucleus of a lithium atom. ... That is why lithium has a larger atomic radius than beryllium.
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The most metallic element is Na. Read the trends given at last to be clear for this answer
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