1. A gas at a low pressure glows if we apply a high voltage to it A gas at a high pressure glows if we apply a high voltage to it False. The right answer is…..

2. Neon is the gas used for red signs Neon is the gas used for blue signs False. The right answer is…..

3. Light bulbs are filled with argon gas Light bulbs are filled with radon gas False. The right answer is…..

4. The metal filaments in a bulb are made of tungsten The metal filaments in a bulb are made of iron False. The right answer is…..

5. Argon is used in the extraction of titanium metal Argon is used in the extraction of steel metal False. The right answer is…..

6. Krypton is used by doctors to operate on eyes Krypton is used by doctors to operate on bones False. The right answer is…..

7. In granite there are small amounts of radium. In granite there are big amounts of radium. False. The right answer is…..

8. Radium breaks down into radon gas Radium breaks down into argon gas False. The right answer is…..

9. Radon gas is radio active so it can become a danger to health Radon gas is not radioactive so it can´t become a danger to health False. The right answer is…..

10. Radon is used to treat cancer Radon is used to treat colds False. The right answer is…..

11. The Periodic Table was created by a Russian scientist The Periodic Table was created by a Swedish scientist False. The right answer is…..

12. The Periodic Table was discovered by Dmitri Mendeleev The Periodic Table was discovered by Casper Dmitri False. The right answer is…..

13. The Periodic Table wasn´t completed by Dmitri Mendeleev, some elements were undiscovered, so he left some gaps. The Periodic Table was completed by Dmitri Mendeleev False. The right answer is…..

14. Germanium was discovered before element 101 Germanium was discovered after element 101 False. The right answer is…..

15. The periodic Table was discovered in 1869 The periodic Table was discovered in 1769 False. The right answer is…..

16. Dmitri was the youngestof 17 children Dmitri was the oldest of 15 children False. The right answer is…..

17. Element 101 was named in honour of its inventor Element 103 was named in honour of its inventor False. The right answer is…..