Fill in the blanks with the words from the table above. You won't need all the words.
Date: 2015-10-07; view: 479.
Fill the cells in the table with the words derived from the given ones.
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) ________ in Group 2 (IIA) and Row 7 of the periodic table. Radium was 2) ______ in by Marie Curie and her husband, Pierre Curie. It was found in an ore of 3) ______ called pitchblende.
Radium is 4) ________, meaning it gives off radiation that can be seen in the dark. Because of its 5) ______, however, it has relatively few uses.
Radium is a brilliant white metal with a 6) _____point of 700°C (1,300°F) and a boiling point of 1,737°C (3,159°F). Its 7) ______ is 5.5 grams per cubic centimeter.
Radium combines with most non-metals, including 8) ______, fluorine, chlorine, and nitrogen. It also reacts with acids with the formation of 9) _______ gas. Radium's chemical 10) ______ are of much less interest than its 11) _________, however.
The amount of 12) _____in the Earth's crust is very small. Its 13) ______ has been estimated to be about 0.0000001 parts per million. It occurs not only in 14)______, but in all 15) _____ that contain uranium. It is formed when uranium 16) ______ radiation and breaks down.
| Verb | Noun | Adjective |
| ................. | discovery | ________ |
| ................. | ................ | penetrating, ................ |
| _______ | ............... | mysterious |
| ................. | search, ............, searching | searching |
| liberate | ............., liberator | ................ |
| .................. | ..............., possessor | possessed, .............. |
| triumph | ............. | ..............., triumphal |
1. Cosmic ray ... solved?
2. The flake type graphite is found to ... extremely low resistivity to electrical conductance.
3. Neils Bohr went to England to study with J.J. Thomson, who had ...the electron in 1897.
4. The ATLAS experiment has continued to record data and to refine the analyses in the ... for the Higgs boson and many other exciting signatures of new physics.
5. According to classical physics, a particle of energy E less than the height 
of a barrier could not ... − the region inside the barrier is classically forbidden.
6. Most physicists in the early years of the twentieth century were engrossed by the electron, such a new and fascinating ...
7. In 1899−1900, physicists Ernest Rutherford and Paul Villard separated radiation into three types: alpha, beta, and gamma, based on ... of objects and ability to cause ionization.
8. When they were discovered, the "X" stood for "unknown," because they were so ...
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