Question

Analyze the following periodic table given below and answer the questions that follow:
Given alongside is a part of the periodic table. As we move vertically downward from $ Li $ to $ Fr $

$ Li $	$ Be $
$ Na $
$ K $
$ Rb $
$ Cs $
$ Fr $	$ Ra $

Which among the following has a larger size of atoms?
i) $ Li $ ii) $ Na $ iii) $ Cs $ iv) $ Fr $
b) which one of the following does not increase while moving down to a group of the periodic table?
i) atomic radius ii) metallic character iii) valence iv) number of shells in an element
c) Name two properties of elements whose magnitude changes while going from top to bottom in a group of the periodic table. In what manner do they change?
d) Rewrite the following statement after correction, if necessary:
‘’Groups have elements with consecutive atomic numbers”

Answer 1

Hint: Atomic radius is the property that increases from top to bottom in the periodic table. Alkali earth metals consist of groups namely hydrogen, lithium, sodium, potassium, rubidium, cesium, and francium. Boiling and melting points change from top to bottom of the periodic table.

Complete answer:
In the alkali earth metals, francium is the element with a high atomic number and has a high atomic radius meaning a larger size than the elements in the alkali earth metals. Thus, $ Fr $ has a larger size.
The valence of the alkali earth metals does not increase while moving from top to bottom. As it is constant.
The atomic radius and melting point, and boiling point are changes while moving down to the group of the periodic table.
Periods have elements with consecutive atomic numbers.

Note:
The periodic table is the representation of chemical elements arranged in the increasing order of atomic numbers. The consecutive atomic numbers were arranged in periods but not in groups. The melting point and boiling point of metals decrease moving down the groups for metals.