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Period 2 element - Wikipedia


The period 2 elements are the chemical elements in the second row (or period) of the periodic ... Period 2 elements obey the octet rule in that they need eight electrons to complete their valence sh...

crossword puzzel periodic1


2. My atomic mass is 35.453. 3. I am not really an alkali metal, but since I ... I have 20 neutrons and am found in your teeth 20, I am a noble gas with 2 electrons.

Periodic 3 - The Science Spot


1. I am a Noble Gas that is found in the 6<sup>th</sup> period. 2. I am a member of the Alkaline Earth family and have 88 electrons. 3. I am a transition metal that is a liquid at ...

What is a noble gas with 2 electrons - Answers.com


Helium... that's what i found in chemicalelements.com ... but on my science homework (Crossword) it doesnt fit because of the L in Chlorine. :/ Helium is a noble ...

The periodic table, electron shells, and orbitals - Khan Academy


The shell closest to the nucleus, 1n, can hold two electrons, while the next shell, ... Because of their non-reactivity, they are called the inert gases or noble gases.

Noble Gas | Noble Gas Electron Configuration | Chemistry ...


The first element of this group is Helium that contains only 2 electrons in its valence ... The noble gas are defined as "the group of chemical elements with low ...

The Periodic Table - Science Education at Jefferson Lab


This is a helium atom. Its atomic mass is approximately 4 (2 protons plus 2 neutrons). ... Valence electrons are the electrons in the outer energy level of an atom. These are the .... Noble Gases are colorless gases that are extremely un- reactive.

Noble Gases - Shmoop Chemistry


Helium is slightly different than the other noble gas elements. It only has two electrons in its outer shell so its valence electron configuration is 1s<sup>2</sup>. Even though it ...

Electron Configurations and the Periodic Table | ChemPaths

chempaths.chemeddl.org/services/chempaths/?q=book/General Chemistry Textbook/The Electronic Structure of Atoms/1241/electron-configurations-and-p

Dec 9, 2010 ... ... the number of electrons that would have to be added in order to attain the same electron configuration as an atom of a noble gas. .... The valence of 2 corresponds with the two 4s valence electrons. .... Am. [Rn] 5f <sup>7</sup> 7s <sup>2</sup>. 96 ...

Neil Bartlett Reactive Noble Gases - Landmark - American Chemical ...


For all except helium, the maximum capacity of the outer electron shell of the noble gas atom is eight electrons. For helium, that limit is just two electrons.

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What is a noble gas with two electrons? | Reference.com


Helium is a noble gas with two electrons. This element is classified as a noble gas because it tends not to form compounds with other...

Chemical Elements.com - Noble Gases


The six noble gases are found in group 18 of the periodic table. ... All noble gases have the maximum number of electrons possible in their outer shell (2 for ...

Periodic Table


Elements can achieve a noble gas electron configuration three ways. An element ... The alkali earth metals (group 2), such as, Mg or Sr lose two e-'s to attain the ...