Why is hydrogen located above group 1A in the periodic table?

Answer 1

Because Hydrogen is in the same group (I) as the alkali metals (Li, Na, K, etc.) without being a metal!

Hydrogen and Periodic Table

Hydrogen (H) is separated as it has only 1 electron and so exhibits some unique behavior.

Most elements lose or gain electrons to reach a noble gas configuration. Most they only do one or the other (but not both usually). For instance fluorine (F) will always gain 1 electron to have the electronic configuration of neon (Ne), while lithium (Li) will always lose one electron to have the configuration of helium (He).

Hydrogen is unique in that it can both gain one electron to have the configuration of He, or it can lose one electron and just be a lone proton with no electrons. A half-filled shell (in this case the 1s orbital) is very unstable. It is better to have no electrons or two electrons. Hydrogen can behave either like an alkali metal and be H+ (having lost 1 electron) or can act more like a halogen and be H- (having gained 1 electron).

Answer 2

It is located in Group 1, also known as the Alkali metals and Lithium family, Period 1, with an atomic number of 1 and a representative symbol of "H".

Answer 3

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

Answer 4

It is first in the periodic table because it is the simplest element with only 1 proton in its nucleus and one electron in the (first) orbital around it.

Answer 5

It has only 1 electron, and all the first-column elements have 1 outermost electron.

Answer 6

Hydrogen's symbol is H in the periodic table because hydrogen begins with H

Answer 7

At the very top. It is the first element and has 1 as the proton number. It doesn't belong to any group.

Answer 8

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Answer 9

because it is