Question

why 2group element are called refractory materials

Answer 1

Because they have high melting point.

Answer 2

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$\mathfrak{\blue{Answer.}}$The bulk of refractory materialsconsist of single or mixed high melting point oxides of elements such as silicon, aluminium, magnesium, calcium and zirconium. ... The actual composition of a refractory material is dependent on operating factors such as temperature, atmosphere and whatmaterials it will be in contact with.
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