A radioactive isotope of strontium Sr is especially dangerous to humans because it tends to accumulate in bone marrow tissues how does this relate to the organization of the periodic table?

Answer 1

Strontium doesn't accumulate in the bone MARROW; it accumulates in the bones themselves.

Bones are primarily calcium, and strontium is in the same column of the Periodic Table. Since it's in the same column, it reacts in similar ways. So if you ingest radioactive strontium (strontium-90, a radioactive isotope, is a common fission fragment) then the strontium may be taken up in place of calcium and incorporated into your bones.

Radioactive bone strontium can kill off the bone marrow, which generates blood cells. This can lead to leukemia and anemia, among other blood diseases.

Answer 2

Same family that calcium is in, group II. So, strontium is taken up as bone building material along with any calcium ingested.