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Chemical industry is engaged in the production and development of chemical industry enterprises and units of the general term. It is an indispensable and important part of the national economy. The development of chemical industry is an important part of the national economy. It is of great practical significance to the sustainable development of human economy and social development.
　　The chemical industry plays an important role in the national economy, and it is the basic industry and pillar industry in many countries. The development speed and scale of the chemical industry have a direct impact on all sectors of the social economy, the annual output value of the world chemical products has exceeded 15000. Because of the wide range of chemical industry, complex technology, diverse products, the discharge of pollutants in the production of many, large quantity, high toxicity, therefore, the chemical industry is a major pollution. At the same time, chemical products in the processing, storage, use and waste treatment and other aspects are likely to produce a large number of toxic substances and affect the ecological environment, endanger human health. The sustainable development of chemical industry is of great realistic significance to the development of human economy and society.
　　Chemical industry, including chemical, oil refining, metallurgy, energy, light industry, petrochemical industry, environment, medicine, environmental protection and military departments engaged in engineering design, fine and daily chemical industry, energy and power, technology development, production technology, management and scientific research of the industry.
　　We will be divided into three major categories of chemical industry: petrochemical, basic chemical and chemical fiber three categories.
　　The basic chemical is divided into nine categories: chemical fertilizer, organic chemicals, inorganic products, chlor alkali, fine and specialty chemicals, pesticides, chemicals, plastic products and rubber products.

Electronegativity of F > Cl > Br

Solution:

Given Density = 8.55 gcm^-3

Let the length of the edge = a cm

Number of atoms per unit cell, Z = 2

Atomic mass M = 93 u

From the formula , density = ZxM/a³ x N₀, we get

8.55 = 2 x 93/a³ x 6.022 x 10²³ = 36.12 x 10^-24 cm³

Now edge length,a = (36.12 x 10^-24)1/3 = 3.306 x 10^-8 cm

Now radius in body centered cubic, r = √3/4 a

Putting the value of a, we get .r = 1.431 x 10^-10 m