Question

i) (a) By referring the following modern periodic table find out the groups to
which the given elements belong.
Element
K
Na
Rb
Cs
Li
Atomic radius (pm)
231
186
244
264
152
(b) Arrange the above elements vertically downwards in an increasing
order of atomic radii.
(c) Does this arrangement match with the pattern of the group 1 of the
modern periodic table.
(d) Which of the above elements have the biggest and the smallest atom?
(e) What is the periodic trend observed in the variation of atomic radii
down a group?​

Answer 1

Answer:

a)Lithium

b)Group no .1

c) Atomic radii increases down a group,as number of shells are adding one at a time

Answer 2

Answer:

(a) The following elements belong to the Group 1

(b) Li

    Na

    k

    Rb

    Cs

(c) Yes, the arrangements match with the pattern of the group 1 of the modern periodic table

(d) Largest atom - Cs ; Smallest atom - Li

(e) The periodic trend observed is that the atomic radius of the elements increases down a group.