printable periodic table of elements noble gases

Printable periodic table of elements noble gases full#

Neon is about two-thirds as dense as that of air.

On the earth, helium is obtained from the decay of radioactive elements like uranium and thorium.

Helium is always floating out of the earth’s atmosphere.

( Note: Hydrogen is first and it is roughly 74% of all the elements in the universe)

Helium is the second most abundant element found in the Universe and it makes roughly up to 24% of it.

The facts of Noble gases are mentioned below. Thus, radon is used in radiotherapy (or cancer therapy) to kill the cancer cells. Radon is chemically inert gas, but it is radioactive in nature. The shell electron arrangement and electronic configuration of Noble gases is shown below: Helium is an exception whose electron configuration is 1s 2. The general outer electron configuration of Noble gases is ns 2 np 6 where n is the number of outer orbit or period number in which the element lies. Atomic number Symbol Name of element 2 He Helium 10 Ne Neon 18 Ar Argon 36 Kr Krypton 54 Xe Xenon 86 Rn Radon Electronic configuration of noble gases The list of Noble gases with atomic number, symbol and name of element is given below.

Hence, group 18 elements are called Noble gases. However, later on chemists found that few of these noble gases can react with some elements to form compounds.

This is why they were called inert gases (or unreactive gases) In fact, they are so stable that in the past chemists thought that they could not react with any other elements (means they are chemically inert).

Printable periodic table of elements noble gases full#

Group 18 elements are called noble gases because they normally do not react with any other elements.Īll these noble gases have full valence shells and this makes them a very stable element.