Choose the best answer to the following.
Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium- dependent bone tissues (calcium, Ca, number 20). This fact relates to the organization of the periodic table in that strontium and calcium are both
(a) metals.
(b) in group 2 of the periodic table.
(c) made of relatively large atoms.
(d) soluble in water.
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