Why size of gallium is smaller than aluminium?
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Because The atomic radius i.e., the metallic radius of gallium (135 pm) is less than that of aluminium (143 pm). ... It is due to the presence of additional 10 d-electrons in gallium which offer poor screening effect for the outer electrons from the increased nuclear charge.
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Size of Ga is smaller than Al because Ga has
10d electrons. In general d orbital shows poor shielding due to their diffused shape. Therefore in Ga , the outermost electrons are tightly held by the nucleus which causes the decreased atomic size of Ga than Al
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