Why is it that while going from Hf to Au, the m. pt. first increases upto tungsten and then decreases ?

Assertion : There are two identical spherical bodies fixed in two positions as shows. While moving from A to B gravitational potential first increases then decreases. Reason : At centre point of A and B field strength will be zero.

Which of the following statements is true about the variation of density of elements in the periodic table? (A)In a period from left to right density first increases upto the middle and then starts decreasing (B)In a group on moving down the density decreases from top to bottom. (C)A less closely packed solid has higher density. (D)Density of elements is not a periodic property.

Explain the following : (i) Why do transition metal ions possess a greater elements increases upto Mn and then decrease.

As we go higher, the density of air increases and hence pressure decreases

Explain the following : The paramagnetic character in 3d-transition series elements increases upto Mn and then decreases.

In the case of chemisorption, why adsorption first increases and then decreases with temperature?

In the case of chemisorption, why adsorption first increases and then decreases with temperature?

On the basis of graph shown answer the following questions : A salt whose solubility first increase and then decrease. .....................

Why in any transition series, melting points first increase and then decrease and also they show a dip in the middle?

Assertion: In any transition series the magnetic moment of M^(2+) ions first increases then decreases Reason: In a transition series, the number of unpaired electrons first increases and then decreases.