Choose the best answer of the following.
Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-rich bone marrow 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 the same vertical column.
(c) made of relatively large atoms.
(d) isotopes of the same atom.
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