Table of Contents
Group 18 Elements Noble Gases ;
Group 18 elements are called the Noble Gases. They are all gases, and they are all inert. This means that they do not react with other elements. The elements in the periodic table that have the atomic number of 18. These elements are helium, neon, argon, krypton, xenon, and radon. All of these elements are found in nature, and they are all colorless and odorless. These elements are also very stable, and they do not react with other element
Properties of Elements From 18 Group
The 18th group of the periodic table of elements consists of three elements-arsenic, selenium, and tellurium. These elements are all metalloids, meaning they have some metallic and some nonmetallic properties.
Arsenic is a brittle, silver-white metal that is very poisonous. It is used in some alloys and in pesticides.
Selenium is a silver-white metal that is also poisonous. It is used in some alloys and in photocopiers.
Tellurium is a silver-white metal that is also poisonous. It is used in some alloys and in solar energy cells.
The occurrence of group 18 elements in the universe is sporadic. They are not found in great abundance, but when they are, they are very useful. In fact, the group 18 elements make up less than 1% of the elemental mass in the universe. However, they are essential to life and are found in all living things.
The first group 18 element, helium, was discovered in 1868 by French astronomer Pierre Janssen. Janssen was observing a solar eclipse when he noticed a yellow line in the sun’s spectrum that was not present in the spectrum of the moon. He realized that this line was caused by helium, which is why helium is also sometimes called the “helium line”.
The next group 18 element to be discovered was neon, in 1898 by Scottish chemist William Ramsay. Ramsay was studying the gas discharge in a tube of neon when he noticed a new line in the spectrum. He named the element neon after the Greek word for “new”.
The third group 18 element to be discovered was argon, in 1894 by English chemist Lord Rayleigh. Rayleigh was studying the gas discharge in a tube of argon when he noticed a new line in the spectrum. He named the element argon after the Greek word for “lazy”.
The fourth group 18 element to be discovered was krypton, in 1898 by English chemist William Ramsay. Ramsay was studying the gas discharge in a tube of krypton when he noticed a new line in the spectrum. He named the element krypton after the Greek word for “hidden”.
The fifth group 18 element to be discovered was xenon, in 1898 by English chemist William Ramsay. Ramsay was studying the gas discharge in a tube of xenon when he noticed a new line in the spectrum. He named the element xenon after the Greek word for “stranger”.
The sixth group 18 element to be discovered was radon, in 1900 by German chemist Friedrich Ernst Dorn. Dorn was studying the gas discharge in a tube of radon when he noticed a new line in the spectrum. He named the element radon after the Latin word for “ray”.
The seventh group 18 element to be discovered was francium, in 1939 by French chemist Marguerite Perey. Perey was studying the decay of actinium when she noticed that a new element was being formed. She named the element francium after the Latin
