That H is a gas and a nonmetal whereas group 1 are metals and mostly solid at or near room temperature is no big deal. Why is hydrogen in 1. and in 17. group. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Answer: Electronic configuration of hydrogen is 1 i.e. So to be stable Hydrogen loses its electron and makes 1 positive charge. Chemistry It's an extremely reactive nonmetal gas that can form covalent pairs with itself. Because Hydrogen behaves unlike most of the other groups, but has characteristics of Groups 1 and 17. Hence, it can also be placed above the halogen group. That is why position of hydrogen is still undecided. Group 1A elements such as H, Li, K,etc. Such that in the chart below comparing boiling points of groups 14-17 hydrides, the values of ammonia (NH 3), water (H 2 O), and hydrogen fluoride (HF) break the increasing boiling point trend. In fact, they are the most reactive metals and, along with the elements in … It forms covalent compounds like halogens unlike alkali metals. Answer:Hydrogen's atomic number is 1,hence there is only 1 electron in outermost shell. IT IS JUST PLACED ABOVE group 1 of th table as it has valency one and cannot be placed with halogens as it has just one valence electron. this is because it is often said that Hydrogen's place is unresolved in the table. The group number determines how many electrons are on the outer shell of the atom. Because hydrogen is so light, the pure element isn't commonly found on the Earth. VIEW SOLUTION. As the radius of the atom increases down group 17 from top to bottom, and the valence shell electrons are increasingly shielded, the positively charged nucleus exerts less of an attractive force on the electrons so it has less ability to attract electrons towards itself, hence, electronegativity decreases down the group from top to bottom. Non-remnant stars are mainly composed of hydrogen in the plasma state. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … That is why position of hydrogen is still undecided. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Hydrogen - Hydrogen - Reactivity of hydrogen: One molecule of hydrogen dissociates into two atoms (H2 → 2H) when an energy equal to or greater than the dissociation energy (i.e., the amount of energy required to break the bond that holds together the atoms in the molecule) is supplied. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. As it has only one electron, and the shell it occupies has a max of 2 it can either lose one electron or … Physical and Chemical Properties of Group 17 Elements Group 17 Elements: The Halogens The elements in Group 17 are: Fluorine Chlorine Bromine Iodine Astatine These elements are known as halogens. please remember ther is some space between the group 1A and Hydrogen. This is one of the factors that dictates the position of hydrogen in the table. Ask your question. Li (Z=3): K 2, L 1 elements in group I-A. Most periodic tables only feature one Hydrogen atom, on the top of the first group. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. They are called “halogens” because they give salts when they react with metals. between group 14,15, and 16 there is a patern between the boiling points with the boiling point being higher for the higher group- but group 17 dosn't fit the pattern it has lower boiling point then group 15 - why? The alkali metals also react readily with water to produce hydrogen gas and metal hydroxides in the following video: Alkali Metals: Explosive reactions. 1. Therefore, instead keeping Hydrogen in group of halogens it should be in group 1st that is alkali metals group. This confirmed Kelly’s findings that the hydrogen fire ball dissipated quickly, providing less damage to the structure in every case versus the JP-1 test. Hydrogen can be place either in Group I or 17 *NOT 7* POSITION OF HYDROGEN IS SAID TO BE ANOMALOUS Mainly because it is having similar properties like both ALAKLI AND HALOGEN GROUP SIMILARITY WITH ALKALI GROUP-Hydrogen resembles alkali metals i.e. In the modern IUPAC nomenclature, this group is known as group 17.. Hydrogen shares many similarities with alkali metals, i.e. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). it has le, IP in nucleus. (4)oxidation state :- just like halogens hydrogen shows an oxidation state of -1.. for example -- NaH like NaCl (both hydrogen and chlorine are in -1 oxidation state), CaH2 like CaCl2 (both hydrogen and chlorine are in -1 oxidation state). Let us talk about hydrogen, a very interesting element, with an instructive video! Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. Explanation : H (Z=1): K 1. State the electronic configuration of hydrogen [at. But it is not a halogen either. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Similar to group 17, it will attract one electron to complete its shell. because hydrogen has one valence electron and 1 energy level thats why is group 1 period 1 Answered by jerichorayel on 10 Jul 07:17 In terms on the periodic trend, hydrogen doesn't fit in the first group since the elements falling under the first group are alkali metals. Hydrogen 1s 1. Hydrogen is considered as a very unique element.The position of this small element in the periodic table is debatable. Join now. The two hydrogens are the same, but some periodic tables show hydrogen in both places to emphasize that hydrogen isn't really a member of the first group or the seventh group. Elements in group IA salts when why is hydrogen in group 17 react with metals.So, now you know halogens! 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