Home Questions Answers Glossary Questionaire Contact Elements 11-20
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
1. Which of the ten elements are colourless and odourless in their gas forms?
ANSWER: Hydrogen, Helium, Nitrogen, Oxygen and Neon
2. Which elements have an atomic radius of more than one hundred?
ANSWER: Helium, Lithium and Beryllium
3. Do all the elements melt at a higher temperature than they boil?
ANSWER: No, the opposite, they all boil at temperatures that are hotter than the temperatures they melt at.
4. Which of the elements have names which originated from Greek words?
ANSWER: Hydrogen, Helium, Lithium, Beryllium and Neon
5. Out of the first ten elements which element has the heaviest atomic weight?
ANSWER: Neon - 20.179
6. Which element has the atomic symbol B?
7. Can you put the top ten elements in order starting with Hydrogen and ending with Neon without looking at a resource?
ANSWER: Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Flourine, Neon
8. Name one common use for each of the elements.
|producing hydrochloric acid|
|reducing metallic ores|
|the hydrogenation of fats and oils|
|Deep sea diving|
|Liquid helium , for low temperature research|
|An gas shield for arc welding|
|A cooling medium for nuclear reactors|
|A gas for supersonic wind tunnels.|
|Advertising on Blimps|
Pressuring liquid fuel rockets
|It has nuclear applications|
|Used in air-conditioning and industrial drying systems|
|Glasses and ceramics|
|Missiles, spacecraft, and communication satellites.|
rockets as an igniter.
|insulation fibreglass and sodium bleach.|
|Treatment of arthritis.|
|As a shield for nuclear radiation, and in instruments used for detecting neutrons.|
|Electrical insulator but conducts heat like a metal.|
|Filaments, a high-strength, lightweight material chiefly employed for advanced aerospace structures.|
Carbon - Carbon is the basis of all life since it is part of DNA. The human body contains about 16 kilograms of carbon in one form or another. Carbon is also important environmentally as carbon dioxide; it makes up 350 parts per million of the atmosphere, and plants take it in as they grow. Carbon dioxide is also the gas formed when natural gas, oil and coal are burned. Coal, petroleum, and natural gas are chiefly hydrocarbons.
Plants and animals rely on oxygen for respiration. Hospitals frequently prescribe oxygen for patients with respiratory problems.
The Ozone is made up of oxygen. It is formed from electrical discharges or ultraviolet light acting on O2. It is an important component of the atmosphere (in total amounting to the equivalent of a layer about 3 mm thick at ordinary pressures and temperatures) which is vital in preventing harmful ultraviolet rays of the sun from reaching the earth's surface.
|compounds are used in air conditioning and refrigeration|
|fluorine has been studied as a rocket propellant|
|fluoride helps prevent dental cavities|
wave meter tubes
and TV tubes.
9. Which Element is the following sentence referring to?
________ is silvery in appearance. It reacts with water, but not as vigorously as sodium. ________ imparts a beautiful crimson colour to a flame, but when the metal burns strongly, the flame is a dazzling white.
10. Research: How many elements are there?
ANSWER: The scientific community has not come up with an exact answer. The most common answer to the confirmed number of elements is: 118