Four elements have the following radii : 117pm, 122pm, 129pm and 134pm. The elements are V, Cr, Nb and Mo. Which one has the radius of 117 pm ?

In group 1 of the periodic table three elements X, Y and Z have atomic radii 133 pm, 95 pm and 65 pm respectively. Giving a reason, arrange them in the order of increasing atomic number in the group.

Atomic radii of some elements in the periodic table are as given below . 152 pm , 186 pm , 231 pm , 244 pm , Do these elements belong to group or period ?

The atomic radii of group 1 elemetns of the periodic table are as follows: Na (186 "pm"), Li (152 "pm"), R(244"pm"),Cs(262"pm") and K(231"pm") . (a) Arrange these element in the increasing order of their atomic radii in a vertical column (keeping the element with the smallest atomic radius at the top). (b) Which elements have the smallest and largest atoms? (c) From this data, infer how the size (or atomic radius) of elements vary as we go doen in the group

The atomic radii of three elements A, B and C of a periodic table are 186 pm, 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

In a period if the atomic radius of the first element is 152 pm, what is the atomic radius of the third element-more than or less than 152 pm?

(a) Explain why: (i) All the elements of a group have similar chemical properties. (ii) All the elements of a period have different chemical properties. (b) The atomic radii of three elements X,Y and Z of a period of the periodic table are 186 pm, 104 pm and 143 pm respectively. Giving reason arrange these elements in the increasing order of atomic numbers in the period.

The edge of unit cell of FC C ionic ceystal is 620 pm. The radius of cation is 134 pm.What is the radius of anion?

A binary solid (AB) has a rock salt structure. If the edge length is 400pm, radius of cation is 80pm the radius of anion is:

A binary solid (AB) has a rock salt structure. If the edge length is 400pm, radius of cation is 80pm the radius of anion is: