Why is helium included with the noble gases even though it only has 2 valence electrons?

It only has two electrons in its outer shell so its valence electron configuration is 1s2. Even though it only has two electrons, it is grouped with elements that have eight valence electrons. Helium is still happy because its outermost shell is completely full making it extremely stable.

Are helium and neon similar?

Neon appears directly under helium, and we expect these two gases to have similar chemical properties because both have a completely filled outer electron shell.

What is the similarity between helium and neon?

Explanation: The filled outer shells of Group VIIIA or the noble gases makes all me members of this family ( including Helium, Neon and Argon) the most stable of all the elements. These three elements have this property in common, a filled stable outer electron shell.

Why do elements in the same group have the same reactivity?

Elements in the same group of the periodic table have the same number of valence electrons. Valence electrons determine many of the properties of an element, so elements in the same group have similar properties. All the elements in group 1 have just one valence electron. This makes them very reactive.

Do helium and neon have the same number of valence electrons?

Neon, like all noble gases, has a full valence shell. Noble gases have eight electrons in their outermost shell, except in the case of helium, which has two.

Is neon a noble gas?

neon (Ne), chemical element, inert gas of Group 18 (noble gases) of the periodic table, used in electric signs and fluorescent lamps.

Do helium and neon have the same number of electrons?

Would neon gain or lose electrons?

Neon has 8 valence electrons. It already has a full valence shell so it does not react easily and does not gain or lose any electrons.

Can Group 2 have helium?

As helium possesses completely filled outer most shell (Duplet configuration) it is placed in group 18 not in group 2.