As you move down a family (group) of the periodic table the size of atoms increases from period 2 to period 3 by about 30-40 pm.  For example, the radius of B is 84 pm and the radius of Al is 121 pm.  However, as you move from aluminum (radius of 121 pm) to gallium (radius of 122 pm) the radius only increases by 1 pm.  Which of the following explains this small increase in radius from Al to Ga? Select one: a. the scandide contraction b. the lanthanide contraction c. the mercurate elongation d. the zincate elongation e. Aluminum is just larger than you might expect.

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