Why is hydrogen not placed in any group on the periodic table?

Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.

Why do you think Helium is placed in group 18 and not 2?

They have completed outermost shell. 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.

Why Helium is placed in group 18 despite having a different outer electron configuration than the rest of its group?

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.

Why can hydrogen be placed in two groups?

Electronically, or by valence, hydrogen belongs in both groups I and VII. Its electronegativity, however, corre- sponds to a chemistry intermediate between the two ex- tremes. Hydrogen is, therefore, placed above the other elements and just to the left of carbon (1a).

Why is hydrogen placed alone on the periodic table?

Hydrogen possesses unique properties which make it stand apart from other elements. Its properties resemble those of alkali metals as well as halogens – it can lose one electron like alkali metals and gain one electron like halogens. Hence, it is placed separately on the top left corner of the Modern Periodic Table.

Why isn’t hydrogen considered an alkali metal?

Hydrogen is not an alkali metal itself, but has some similar properties due to its simple one proton (loctated in the nucleus), one electron arrangement. The group I elements react rapidly with oxygen to produce metal oxides. They are very soft metals, which become liquid just above room temperature.

Does helium belong to Group 2?

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

Is helium placed in group 18 on the periodic table?

Helium is the second element on the periodic table. It is located in period 1 and group 18 or 8A on the righthand side of the table. This group contains the noble gases, which are the most chemically inert elements on the periodic table. Each He atom has two protons and usually two neutrons and two electrons.

Why is helium placed on the far right of the table?

They don’t need to react or join up with other elements to form compounds, nor do they want to give up their electrons, so helium and other noble gases like neon and argon tend to float around by themselves. The noble gases are located in the far right column of the periodic table of elements – in group (column) 18.

Why doesn’t helium follow the drop the one rule?

Helium atoms have two electrons and two protons. There is only one shell of electrons, the valence shell of two electrons. It is a noble gas and is thus relatively inert. If it needs to gain electrons as part of a bonding sequence, it will need to form a new valence shell further away from the nucleus than the old one.

Is helium Reactive or nonreactive?

Noble gases
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. They include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Noble gases are the least reactive of all known elements, because with eight valence electrons, their outer energy levels are full.

Why is helium where it is on the periodic table?

Helium is the second element on the periodic table. This group contains the noble gases, which are the most chemically inert elements on the periodic table. Each He atom has two protons and usually two neutrons and two electrons.

Why can’t helium be placed in Group 2?

Because it will be lonely all by itself in group 2 Helium has a filled primary quantum number orbital so its chemical properties align much more closely to the other inert gases than to Be, Mg etc. However some of the properties of Be are similar to but far from identical to the inert gases.

Why is helium not Very electronegative?

Helium is not very electronegative because the first valence shell of electrons holds two electrons. This corresponds to helium’s atomic number of 2. It is also inert and monatomic, leading to be the second least reactive noble gas behind neon, and therefore the second least reactive element of all. Thus, it gives no electrons to other elements.

How many protons and electrons are in the element helium?

Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The chemical symbol for Helium is He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.

What is the state of matter of helium?

It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements. Helium is a chemical element with atomic number 2 which means there are 2 protons in its nucleus.