Ionic radii `"________"` with increases in atomic number in a period
and `"_______"` in a group.

Ionic radii of

Ionic radii are

Ionic radii are

Ionic radii of :

Ionic radii vary in

The order of increasing atomic radii is

What will be the atomic number of an element which belongs to period 8 and group 2.

Atomic size decreases in a ___________of the periodic table as the atomic number increases from left to right. (group/period)

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture: A)In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group B)The reactivity decreases in the alkali metals but increases in the halogens with increases in atomic number down the group. C)In both the alkali metals and the halogen the chemical reactivity decreases with increases in atomic number down the group D)Chemical reactivity increases with increases in atomic number down the group in both the alkali metals and halogens.

How do the following properties of group 1 and group 2 elements vary with increase in atomic number? (i) Atomic and ionic radii (ii) Density (iii) Melting and boiling points (iv) Electropositive character Give suitable explanation for the variation in each case.