The atom

I. Read and translate the text.

According to the modern theory all matter is composed of atoms. There are many kinds of atoms. Each atom consists of a nucleus, a small positively charged mass and a number of negatively charged particles called electrons, which revolve around the nucleus. Normally each atom is electrically neutral. If the number of negative charges is not equal to the number of positive charges, the matter will produce electrical effects. When an electric charge is at rest it is spoken of as static electricity, but when it is in motion it is referred to as an electric current.

II. Match the words with their translation

1. flow	вдосконалювати
2. matter	вимірювати
3. wire	якість
4. equipment	потік
5. path	притягатися
6. charge	матерія
7. to use	збільшувати
8. to measure	відштовхуватися
9. switch	обладнання
10. to repair	шлях
11. quality	використовувати
12. to improve	вимикач
13. to repel	заряд
14. to attract	ремонтувати
15. to increase	дріт

III. Answer the questions on the text.

1. What is all matter composed of?

2. What does each atom consist of?

3. When will the matter produce electrical effects?

4. What is static electricity?

IV. Choose the best variant.

1. The atom is made of … parts.

a)very small b) very big c) huge

2. Electrons have a…. charge.

a) positive b) negative c) neutral

3. Atoms have … number of electrons and protons.

a) different b) the same c) interesting

4.When you rub things together … can move from one atom to another.

a) protons b) electrons c) neutrons

5. Two things attract each other when they have … charges.

a) the same b) different c) negative d) positive

6. Electricity is a … of electrons.

a) form b) current c) flow d) charge

7.The nucleus of an atom is surrounded by … .

a) neutrons b) electrons c) protons

8.A path of electricity is called a (an)… .

a) flow b) atom c) circuit

9.The number of electrons in an atom is usually … to the number of protons.

a) equal b) different c) quick

10.Wires … electricity to our houses.

a) blow b) carry c) catch d) flow

11. Which particles have approximately the same size and mass as each other?

a) neutrons and electrons b) electron and protons c) protons and neutrons

12. An element is determined by the number of … .

a) atoms b) electrons c) protons

13. The nucleus of an atom consists of … .

a) electrons and neutrons b) protons and neutrons c) protons, neutrons and electrons

14. Which two particles would be attracted to each other?

a) electrons and neutrons b) electrons and protons c) protons and neutrons

15. The atomic number of an atom is … .

a) the number of electrons b) the number of neutrons c) the number of protons