Size of lethium is more than brelium. why?
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This means that the nucleus of a beryllium atom will pull on the outermost electrons with more force, effectively compressing the distance between itself and these electrons. That is why lithium has a larger atomic radius than beryllium. In fact, atomic radius decreases as you move from left to right across a period.
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The beryllium atom is noticeably smaller than the lithium atom. This is because of the increase in nuclear charge from +3 to +4. ... The effective nuclear charge holding a 2s electron to the nucleus is thus nearly +2, about twice the value for lithium, and the 2s electron clouds are drawn closer to the center of the atom.
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