7
4 7
4 7
4 7 Some
Some
Some
Some
Some
Applications
Applications
Applications
Applications
Applications
of d- and
of d- and
of d- and
of d- and
of d- and
f-Block
f-Block
f-Block
f-Block
f-Block
Elements
Elements
Elements
Elements
Elements
Iron and steels are the most important construction materials