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Why hydrogen is placed in the left hand side of the periodic table?
Moving from left to right the metallic character decreases and non-metallic character increases. At the extreme left elements are non-metallic in nature. Now hydrogen is placed in group one of the modern periodic table. This is because of some similarity of properties of hydrogen with group one elements.
Why is hydrogen placed on both sides of the periodic table?
Why is Hydrogen Placed in Both Periodic Table Groups? Hydrogen holds one valence electron in its outermost shell, and therefore it contains similar chemical properties compared to alkali metals. Also, hydrogen exists as a diatomic molecule similar to halogens and produces compounds with both metals and nonmetals.
Why is hydrogen placed where it is in the periodic table?
Because hydrogen has an atomic number of one, it has only one electron in its atom and consequently only one electron in its outermost shell, making it the first element in the periodic table. The electrical configuration of elements determines their placement in the periodic table.
Why the position of hydrogen in periodic table is controversial?
Hydrogen can gain one electron and can become H− just like halogens (Group 17). It can also loose an electron and can become H+ just like alkali metals (Group 1). Hence the position of hydrogen is controversial in the modern periodic table.
Why can hydrogen be placed in either group 1 or 7?
Assertion :Hydrogen can be placed in both I A group and VII A group of the modern periodic table. Reason: Similarity in properties with both IA and VII A group.
Why is hydrogen placed in group 1 and not 17?
The reason why the hydrogen can be placed in both group 1 and group 17 is that it resembles Alkali metals in some of its properties like it can easily form cations so, it can be placed in Group 1 of periodic table but it also resembles Halogens in its properties like it forms H2 which is true property of halogen that ...
Why is hydrogen located in a group with reactive metals?
Hydrogen is located in group 1 on the periodic table with reactive metals because it has the same electron configuration as the rest of the metals in this group. Group 1 is the alkali metals, and each has just one electron in its outer shell, making them very reactive. Hydrogen is not a metal but is a gas.
Why is the position of hydrogen not justified in modern periodic table?
Hydrogen's similarity with two completely different groups of elements in the modern periodic table has made it difficult for scientists to place it in particular group and hence the position of hydrogen in the modern periodic table is not fixed.
Is the position of hydrogen justified?
Solution : Its position in periodic table is not justified because it resembles both alkali metal and halogens.
What objection is made to the position of hydrogen in modern periodic table?
Its atomic number is 1 with one electron. This electron is present in its first shell. Hydrogen resembles both alkali metals as well as halogens therefore its position is said to be anomalous.
Why are hydrogen and helium on opposite sides of the periodic table?
The Space Between Elements Helium is separated by space from hydrogen because it has a filled valence electron shell. In the case of helium, the two electrons make the valence shell the only electron shell. The other noble gases in group 18 have 8 electrons in their valence shell.
Why are hydrogen and helium placed by themselves on the periodic table?
The first 2 elements - hydrogen and helium - complete their outer electron shells at 2 electrons instead of the usual 8. So helium has noble gas properties, like e.g. neon, but hydrogen has its own specific properties, neither halogen nor alkali metal. So it's in its own category and placed separately.
Why are hydrogen and helium at the top of the periodic table?
Hydrogen and helium are peculiar because they don't fit in the system. Hydrogen is so different from any other element that the most ordered option is to place it at the top of group 1, the first column, because of its electronic configuration, in spite of not sharing the typical properties of said group.
What two groups are hydrogen in on the periodic table?
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).