Which one of the following elementS has the highest density? A)Cr B) Ni C)Os D)

Question

Which one of the following elementS has the highest density? A)Cr B) Ni C)Os D) Ta E) cannot be determined 4. Which transition element has the highest melting point? A)Fe B) V C) Mo D)W 5. Though we would expect an increase in atomic radii going down a group from the second to the third transition series of elements, the actual radii are nearly identical. The term commonly used to describe this phenomenon is the. a) atomic disparity b) effective nuclear charge c) lanthanide contraction d) transition default e) None of these terms describe this phenomenon 6. If M repretents a transition element, which of the following oxides should hate the most covalent character? a. MO b. M_2O C. M_2O_3 d. MO_2 e. MO_3

Explanation / Answer

3. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3

4. W (Tungsten) has the highest melting point of all the non- alloyed metals and the second highest of all the elements after carbon.

5. Lanthanide contraction. This term is being used in chemistry to describe the greater-than-expected decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, which results in smaller than otherwise expected ionic radii for the subsequent elements starting with 72, hafnium.

6. Option (e) MO3 because in this case oxidation state of M = +6. This indicates the smallest size of M ion and this in turn have highest polarizing effect for the electron density of oxygen ion giving more covalent nature of bond.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.