5. Decide whether the statements below are true or false according to the information in exercise 4

1. An atom consists of molecules with a fixed number of protons and neutrons.

2. There is no difference between a chemical compound and a chemical element.

3. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal.

4. A covalent bond is characterized by the sharing of pairs of electrons between atoms.

5. Molecules are electrically neutral and consist of atoms bound together by covalent bonds.

6. Answer the questions

1. What is an atom?

2. What is a molecule?

3. What is the smallest particle in the world?

4. What is a chemical element?

5. What chemical elements do you know?

6. What is a substance?

7. What is a compound?

8. What chemical compounds do you know?

9. What types of chemical bonds do you know?

7. Read the following text and make a brief report in Russian

Several terms are commonly used to characterize the general physical and chemical properties of the chemical elements. A first distinction is between the metals, which readily conduct electricity, and the nonmetals, which do not, with a small group (the metalloids) having intermediate properties, often behaving as semiconductors.

There is a broad version of element classification used in the periodic table: actinides, alkali metals, alkaline earth metals, halogens, lanthanides, metals, metalloids, noble gases, nonmetals, and transition metals. In this system, the alkali metals, alkaline earth metals, and transition metals, as well as the lanthanides and the actinides, are special groups of the metals viewed in a broader sense.

Another commonly used basic distinction among the elements is their state of matter: solid, liquid, or gas, at a selected standard temperature and pressure.

Each element has its own physical and chemical properties. Melting and boiling points, typically expressed in degrees Celsius at a pressure of one atmosphere, are commonly used in characterizing the various elements. The density at a selected standard temperature and pressure (STP) is frequently used in characterizing the elements. Density is often expressed in grams per cubic centimeter (g/cm³).

https://en.wikipedia.org/wiki/Chemical_element

8. Find the Russian equivalents for the following phrases

distinction _____________________

element classification _____________________

intermediate properties _____________________

alkali metals _____________________

alkaline earth metals _____________________

standard pressure _____________________

at selected temperature _____________________

in a broader sense _____________________

various elements _____________________

to be expressed in grams _____________________

gram per cubic centimeter _____________________

semiconductor _____________________

to conduct electricity _____________________

transition metal _____________________

noble gas _____________________

periodic table _____________________