in periodic table of elements, why does hydrogen belong in Alkali metals not in Noble gases?

Question

if hydrogen is a gas why does it belong to alkali not in noble gases?

Answer 1

Just because Hydrogen is a gas doesn't mean it can't be a metal.
It is placed there because as said before it only has 1 outer electron, which is the characteristic trait of all alkali metals.
It would not be a noble gas because it is highly reactive, (Remember the Hindenburg explosion?) and noble gasses are highly non-reactive (Xenon, Krypton, and Radon have been known to form compounds with Fluorine though).
Hydrogen does have most properties of the metals though, for example in its liquid form it conducts electricty and heat very well, in its metallic form it shows metallic bonding of its electrons, and it also shows the same charges as metals (e,g; positive charges).
So technically Hydrogen is correctly placed in the alkali metals column.

Answer 2

Hydrogen with Z=1 has one electron on its shell K . The shell K, is completed with 2 electrons . So hydrogen can not be put with the noble gases which have their shell full. (It is helium Z=2 which belongs to the noble gases) .For the valence of hydrogen you know that in a molecule all the atoms must have their valence shell either complete or empty. For hydrogen we can empty its shell in taking its unique electron. So , hydrogen is good classified as alkali metals which have one electron on its valence shell

Answer 3

hydrogen is in the same group as the alkali metals because it, like the alkali metals, is on electron short of a full valence. (H ions are 1
+, likewise, Li+, Na+, K+, etc)

Although H is a gas at room temperature, it does not change its reactivity. H will react with group 7 elements readily, just like the elements below it. The difference is that H has a maximum valence of 2 electrons, while the others have 8 or more.

Answer 4

Yipes!

Hydrogen is not a member of the Alkali Metals but acts (most of the time) chemically like the Alkali's' (lose one electron to have a full outer shell). It also can be like the Halogens (gain one electron to have a full outer shell).

State of Matter under normal conditions has nothing to do with the family the element belongs in. Think 'Valence Electrons'.

Get an "A".

Answer 5

To be classified as a noble gas, the atom of the element must have 8 valence electrons or 2 valence electron (if it has only one electron shell). This is also the reason why noble gas do not undergo any chemical reactions as they are chemically very stable.

Hence, hydrogen cannot be classified as a noble gas as it only have one valence electron which is similar to that of an Alkali metal.

Answer 6

Hydrogen is extremly reactive. It is not inert as the noble gases(outer ring of electrons full). It has 1 electron in the outer ring like the metals in column 1. The other column where H is sometimes found is 17 where the elements need 1 electron to fill their outer ring. Elements aree not put into the periodic table as liquids, gases and solids, but by their electron arrangement.

Answer 7

Hydrogen does not belong to the Alkali metals. However in some Periodic Tables you will see it over Lithium (Li), the first of the Alkali metals. That is because hydrogen has one electron in 1s subshell, so it belongs to the s1 group of the P.T.

Answer 8

Well... hydrogen is not a noble gas. And its on the first group because it`s the first element. And it is not alkali metal.

Answer 9

Noble gases are otherwise known as Inert gases. AS the name implies, they are chemically inert because they have attained stable configuration and have satisfied the criterias of Law of Octet and Law of duplet(in case of helium). Thus hydrogen can't be placed there since it is a positively charged cation. But even today in the Modern Periodic Table the position of Hydrogen is injustified.

Answer 10

it is explained that hydrogen is an exception in the table. It is neither a noble gas nor alkali metals. However it has only one eletron in its shell so it has to be put in the collumn one , it's the rule of the chart. And even Mendeleve couldn't explain why he did that.