III. Find English equivalents to the following Russian words and word combinations.

1) ионы (n) 8) химические связи (n)

2) структура (n) 9) пространственная решетка (n)

3) электроны (n) 10) перекрывающий (adj)

4) частично совпадающий (adj) 11) металлоид (n)

5) диапазон проводимости (n) 12) диапазон валентности (n)

6) изолятор (n) 13) переходные металлы (n)

7) блеск (n) 14) точка плавления (n)

IV. Match the words from two columns to make word combinations. Each word can be used only once:

A B

1) characteristic of a) conductivity

2) to prevent b) positive ions

3) thermal c ) their corrosion

4) binding energy d) silvery-grey reflectiveness

5) to form e) of metal

V. Match the word from two columns with its synonym:

1) reflectiveness a) external

2) ductile b) fragile

3) brittle c) luster

4) conduct d) malleable

5) outer e) convey

VI. Are the statements true or false? Correct the false ones with the right information from the text and discuss your answers with the partners.

1. Metal is an element that readily loses electrons to form positive ions (cations) and has metallic bonds between metal atoms.

2. Metals do not form ionic bonds with non-metals.

3. Most elements in the periodic table, a diagonal line drawn from boron to polonium are metalloids, sometimes are called semi-metals.

4. Traditionally, metals have certain characteristic physical properties: they have metallic luster, low density, a high melting point. They are ductile and malleable, hard, solid at room temperature and conduct electricity, heat and sound well.

5. Most metals are chemically reactive, reacting with oxygen in the air to form oxides over changing timescales.

VII. Answer the questions.

1. What is metal?

2. How are metals distinguished?

3. What category of metals have been made by researchers and employed in high-tech devices?

4. What are the ways to prevent corrosion of metals?

5. What are the characteristic physical properties of metals?

VIII. Put the sentences in the right order according to the text. Use them as a plan for retelling.

1. The traditional definition focuses on the bulk properties of metals.

2. Usually metals have certain characteristic physical properties.

3. In chemistry, a metal is an element that readily loses electrons to form positive ions (cations) and has metallic bonds between metal atoms.

4. Alternative definition opens up the category for metallic polymers and other organic metals, which have been made by researchers and employed in high-tech devices.

5. Most elements on this line are metalloids, sometimes called semi-metals.

Part II