Question

Os का घनत्व Fe एवं Ru से अधिक क्यों होता है ?
Why density of Os is more than Fe and Ru.​

Answer 1

Answer:

After all, each atom weighs more. But, density is mass per unit volume. Osmium (and iridium) have a very small atomic radius, so the mass is packed into a small volume. ... Also, the high atomic number of osmium brings relativistic effects into play