13. Match the words with their definitions.

    1	bacterium	f	any of a large group of one-celled organisms that lack a cell nucleus, reproduce by fission or by forming spores, and in some cases cause disease
    2	residue	i	the remainder of something after removal of parts or a part
    3	pitchblende	a	a blackish mineral that is a type of uraninite and occurs in veins, frequently associated with silver: the principal source of uranium and radium.
    4	opaque	g	impenetrable by light; neither transparent nor translucent
    5	to penetrate	b	to enter into and permeate
    6	evident	d	easily seen or understood; obvious
    7	fraction	h	a small part; a bit
    8	to announce	c	to make known publicly
    9	minute	e	exceptionally small; tiny

14. Find 7 words from the table above.

    p	M	w	c	i	r	t	m	n	a	j	a
    i	B	a	c	t	e	r	i	u	m	h	t
    t	W	z	q	s	s	h	r	q	i	z	f
    c	H	r	d	n	i	z	m	k	n	k	r
    h	L	x	k	m	d	s	t	x	u	l	a
    b	O	p	a	q	u	e	w	w	t	x	c
    l	F	y	l	n	e	v	i	d	e	n	t
    e	R	e	e	o	z	n	y	z	p	u	i
    n	E	a	i	o	w	s	t	e	f	j	o
    d	K	k	o	p	q	k	q	z	c	q	n
    e	R	n	a	g	d	w	x	f	e	g	j

15. Fill in the word from the list below. Use each word only once. Translate the collocations into Ukrainian.

    1	the field of physics	6	to give off the rays
    2	to repeat the experiments	7	the salt of thorium
    3	the leather pocketbook	8	to become phosphorescent
    4	to ex­plain this phenomenon	9	to liberate heat
    5	the mysterious rays	10	chemical element

16. Find the words in the texts to which the following are the synonyms. The first letter is given to make the task easier.

conclude, accomplish (complete); do again (repeat); make public, declare (announce); pervade (penetrate); non-transperent (opaque); obvious, clear (evident); consent, assent (permission); emit (give off); astonishing (amazing); gain (obtain); eject (remove)

17. Match the words and phrases with their Ukrainian equivalents.

    1	pitchblende	f	уранова смолка
    2	self-satisfaction	i	самозадоволення
    3	to give off	a	виділяти
    4	neighbourhood	g	сусідство
    5	opaque	b	непрозорий
    6	fraction	d	частинка
    7	residue	h	осад
    8	minute	c	дрібний
    9	to draw near	e	наближатися

18. Translate the following phrases from the text into Ukrainian.

1. photographed through the leather pocketbook;

2. sunlight penetrated windowglass;

3. it was soon evident that …

4. far from being at the end;

5. new lines of work;

6. the ore from which uranium is obtained;

7. four times as strong as those;

8. in honour of her native Poland;

9. came to a triumphant conclusion;

10. a fraction of a grain

19. Fill in the proper word from the list below.

abundance, ores, density, uranium,  element, melting, discovered, properties, gives off, radiation, radium, radioactivity, luminescent, oxygen, pitchblende, hydrogen.

Radium is a radioactive 1) element in Group 2 (IIA) and Row 7 of the periodic table. Radium was 2) discovered by Marie Curie and her husband, Pierre Curie. It was found in an ore of 3) uranium called pitchblende.

Radium is 4) luminescent, meaning it gives off radiation that can be seen in the dark. Because of its 5) radiation, however, it has relatively few uses.

Radium is a brilliant white metal with a 6) melting point of 700°C (1,300°F) and a boiling point of 1,737°C (3,159°F). Its 7) density is 5.5 grams per cubic centimeter.

Radium combines with most non-metals, including 8) oxygen, fluorine, chlorine, and nitrogen. It also reacts with acids with the formation of 9) hydrogen gas. Radium's chemical 10) properties are of much less interest than its 11) radioactivity, however.

The amount of 12) radium in the Earth's crust is very small. Its 13) abundance has been estimated to be about 0.0000001 parts per million. It occurs not only in 14) pitchblende, but in all 15) ores that contain uranium. It is formed when uranium 16) gives off radiation and breaks down.