Why is helium a noble gas if it only has 2 valence electrons?

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 1s2. The noble gases are happy with their completely filled valence shells. Because of their uber-high stability, the noble gases are relatively unreactive.

Why is helium in Group 18 even though it has only 2 valence electrons?

As helium has completed outermost shell it is placed in 18th group. Hence helium is placed in 18th group . It can only hold 2 electrons in its outer most shell. Group 18 are “happy” because they all have full outer shells.

Why is helium considered as a noble gas?

Helium is a noble gas meaning that it exists only as atoms of the elements that are never bonded to other atoms. This lowest electron shell can contain a maximum of only 2 electrons, so helium has a filled electron shell.

Why does hydrogen and helium only need 2 valence electrons?

Why do Hydrogen and helium only need two valence electrons? They want to be like Nobel gases and be full but since they only have one it’s easier to just fill the first shell of an atom. That hydrogen only needs two electrons to fill its first shell to be happy like helium.

What is the only noble gas with two valence electrons?

helium
Noble gases are the least reactive of all known elements. Their outer energy levels are full because they each have eight valence electrons. The only exception is helium, which has just two electrons.

Why is helium a noble gas if it doesn’t have 8 valence electrons?

Noble gases are almost completely because they have eight valence electrons. Noble gases are the least reactive of all known elements. That’s because with eight valence electrons, their outer energy levels are full. The only exception is helium, which has just two electrons.

Does helium have a noble gas configuration?

Explanation: Helium’s electron configuration is [1s2] . But, helium is in the last row of the periodic table, which are noble gases. [He] .

Is helium A inert gas?

helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).

Does helium only have one atom?

It is the number of protons in the center, or nucleus, of an atom which makes each type of atom unique. Helium is an element, which means it is made of only one type of atom, the helium atom. Helium atoms always have two protons each, and changing its number of protons would make it a different element altogether.

Why does hydrogen only need 2 electrons?

Hydrogen atoms follow the duet rule (not the octet rule). This is because it has only one shell and this shell can only hold 2 electrons.

Is helium stable with two valence electrons?

Noble gases are the least reactive of all known elements. Their outer energy levels are full because they each have eight valence electrons. The only exception is helium, which has just two electrons. A full outer energy level is the most stable arrangement of electrons.