Why is hydrogen not considered a member of group 1?

Answer 1

Group number indicates the number of valence electrons or outer electronic configuration. Group 1A elements such as H, Li, K,etc. have 1 valency. Hydrogen also has only one electron. Therfore it is placed in Group 1.

Also, as its atomic number is 1,it is first in the Periodic Table.

Metals have a tendency to donate their valence electrons and form positive ions. Hydrogen also forms a cation generally. Element Sodium (2,8,1) forms a positive ion by donating its 1 electron to Chlorine (2,8,7). Hydrogen also possess the properties of alkali metals as well as halogens, therefore some modern periodic tables have discarded hydrogen or taken as an unimportant element in the table.

Hope this answer would prove useful to you.

Answer 2

Hydrogen differs from the group I elements in that it is a diatomic gas (H2), which is like the group 7 halogens. The group 1 elements are alkaline metals, but hydrogen has one feature that is like them: in an ionic bond, they lose the single electron in their outer shell and are quite content as a +1 ion.

The individual atoms generally have only 1 proton and 1 electron, with no neutrons.

Answer 3

It is separated because Hydrogen is a nonmetal while all the other elements in Group A are metals, specifically Alkali Metals.

Answer 4

the rest of the elements are alkali metals while hydrogen is a gas.

Answer 5

hydrogen is sperated from group 1 because even though it has one electron on its outermost shell (its only shell) it is not a metal which the rest are
group 1 is called the alkali metals

Answer 6

Hydrogen has 1 valence electron (its only electron), so it is placed atop group one, however, it is not an alkali metal (the rest in that group are.)

Answer 7

Hydrogen is not separated; IUPAC periodic table places hydrogen in the group 1 and period 1.

Answer 8

It only has one neutron.