Explain why vanadium (radius=134 pm) and copper (radius=128 pm) have nearly identical atomic radii, even though the atomic number of copper is about 25% higher than that of vanadium. What would you predict about the relative densities of these two metals? Look up the densities in a reference book, periodic table, or on the Web. Are your predictions correct?
(please be quick!)

Question

Explain why vanadium (radius=134 pm) and copper (radius=128 pm) have nearly identical atomic radii, even though the atomic number of copper is about 25% higher than that of vanadium. What would you predict about the relative densities of these two metals? Look up the densities in a reference book, periodic table, or on the Web. Are your predictions correct?
(please be quick!)

anonymous · Answer

Also urgent: Suppose you were trying to find a substitute for Na+ in nerve signal transmission? 
Where would you begin your search? What ions would be most like Na+? For each ion you propose, explain the ways in which it would be similar to Na+ and the ways it would be different. Use periodic trends in your discussion. Thank you!!!!