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Why is the position of hydrogen not justified in periodic table?
Because hydrogen resembles both Halogens and Alkali Metals.
Which elements are both alkali metals and halogens?
No element is a member of both the halogens and the alkali metals. Hydrogen shares some properties of the two groups, but belongs to neither. It is instead in a group all its own.
Can Hydrogen make bond with alkali metals?
No, hydrogen is a nonmetal. It is grouped with the alkali metals because it has a similar outer shell electron configuration as they do. Hydrogen is something of an oddball among elements. It is rather unique, but share some characteristics with both the halogens and the alkali metals. When the periodic table is divided into groups (noble gasses, halogens, alkali metals, etc.) hydrogen is usually put in its own group.
Why is the position of hydrogen not fixed in the activity series?
Hydrogen shows the properties of both 1st and 7th groups:Resemblance Of Hydrogen With Alkali Metals(Group I-A)Like alkali metals hydrogen has one electron in its valency shell.ExplanationH (Z=1): K1Li (Z=3): K2, L1Na (Z=11): K2, L8, M1(2) Valance shell electronic configuration of hydrogen and alkali metal is same.ExplanationH (Z=1): 1S1Na (Z=11): 1S2,2S2,2P6,3S13) Both hydrogen an alkali metals are good reducing agents.4) Like alkali metals hydrogen can also form halides.Explanation: Hydrogen has capability to form Cation and least electronegative than halogens. For example:Hydrogen: HCl, HI.I-A: NaCl, KBr.Resemblance with Halogens:Both Hydrogen and Halogens require one electron to complete their valence shell.Both hydrogen and Halogens are non-metals (Except iodine which has partial metallic character).Both hydrogen and Halogens acts as negative ions when combined with metals.Their molecules are diatomic.Like Halogens, hydrogen can also form both ionic and covalent bond. Explanation: Hydrogen is least metallic as compared to other 1st group metals. For example:Hydrogen: NaH (ionic), CH4 (Covalent)Halogens: NaCl (ionic), HClHydrogen can receive maximum one electron to complete its octet to form anion and get give oneelectron only to form cation. Therefore cannot be fixed in single group.
Why do halogens form compounds with alkali metals?
Because halogens form negative ions, alkali metals form positive ions; both are reactive elements and an electrostatic attraction exist.
Which group of metals do halogens usually bond with offer an explanation?
For example halogens easily react with alkali metals because both are very reactive; compounds are with ionic bonds.
Why H cannot be placed in group 1a although its electronic configuraion is similar to group 1a?
It is so because it also resembles the the halogens. The enthalpy of bond dissociation of Hydrogen is quite similar to Halogens. Its properties resemble both alkali metals and the halogens but differ from them too. So, it is not placed with any of them.
Why is hydrogen placed in the same group a alkali metals?
Although hydrogen is written above the alkali metals on the periodic table, it is not an alkali metal. It is only placed in that location because it has 1 electron in its outermost s orbital, like the alkali metals. Some tables put hydrogen all by itself above the rest of the table in the middle, with lines running from it diagonally down to both lithium and fluorine, to indicate its ability to either accept or donate a single electron to achieve a filled outer shell. However, it doesn't really belong with the alkali metals or with the halogens.
Classes of elements?
Metals, non metals and metaloids (which have some of the properties of both metals and non metals).
Is fluorine an alkali metal or halogen?
No single element can be both an alkali metal (form +1 cations) and a halogen (form -1 anions).Alkali metals :LithiumSodiumPotassiumRubidiumCesiumFranciumHalogens:FluorineChlorineBromineIodineAstatine
What are the Group 1A and Group 7A elements examples of?
Sodium and Chlorine = Sodium Chloride Potassium and Iodine = Potassium Iodide
What due know the position of hydrogen in the periodic table and also write down similarities and dissimilarties with 1 group 4A AND 7A?
Position of hydrogen in periodic tablePosition of an element in periodic table depends upon its electronic configuration and properties. Hydrogen resembles the elements of group I-A, IV-A and VII-A in some respects. Properties of hydrogen do not completely match any one of the above-mentioned groups. That is why position of hydrogen is still undecided.Resemblance Of Hydrogen With Alkali Metals(Group I-A)1) Like alkali metals hydrogen has one electron in its valence shell.ExplanationH (Z=1): K1Li (Z=3): K2, L1Na (Z=11): K2, L8, M1(2) Both require just one electron to complete their valence shells.3) Both hydrogen an alkali metals are good reducing agents.4) Like alkali metals hydrogen can also form halides.Explanation: Hydrogen:HCl, HI.I-A:NaCl, KBr.5) Halides of alkali metals and hydrogen ionized in similar way in aqueous solution.Explanation:HCl (aq) è H+(aq) + Cl-(aq)NaCl(aq) è Na+(aq) + Cl-(aq)6) Like alkali metals hydrogen can also form compounds with non-metals.Explanation:I-A:Na2SHydrogen:H2S7) Both lose electron to form positive ions. E.g. H+, Na+8) Alkali metals and hydrogen belongs to s block.DIFFERENCES :-1) Hydrogen is a non-metal where as elements of I-A are metals.2) Hydrogen can form both covalent and ionic compounds. But alkali metals only form ionic compounds.3) Hydrogen can gain an electron to form H- ion.4) Hydrogen is a gas at room temperature but alkali metals are solids.5) Unlike Na+ or K+ hydrogen ion (H+) is unstable in water.Explanation:H+ + H2O è H3O+6) Alkali metals do not occur freely in nature due to their high reactivity but hydrogen does occur.7) Hydrogen occurs in diatomic state (H2).8) I.P. of hydrogen is very high as compared to alkali metals.Resemblance of Hydrogen with Carbon Family (IV-A)1) Valance shell of hydrogen is half-filled like the elements of group IV-A.Explanation:H (Z=1) : Capacity of K-Shell =2 , no. of electrons = 1 , % = 50%C(z=6) : Capacity of L-Shell = 8 , no. of electrons = 4 , % = 50%2) I.P. and E.A. of hydrogen and carbon are comparable.3) E.N. of H and Carbon family are almost similar. [H = 2.1, C = 2.5 , Si= 2.4]4) Both show reducing effects.Explanation:CuO + H2 è Cu + H2OSnO2 + C è Sn + CO25) Both combine with other elements through covalent bonding.ExplanationDIFFERENCES1) Carbon is tetravalent but Hydrogen is a mono-valent.2) Hydrogen is a gas at room temperature but elements of group IV-A are solids.3) Boiling and melting points of hydrogen is very less than that of the elements of group IV-A.Resemblance Of Hydrogen With Halogens1) Both Hydrogen and Halogens require one electron to complete their valence shell.2) Both hydrogen and Halogens are non-metals(Except iodine which has partial metallic character).3) Both hydrogen and Halogens acts as negative ions when combined with metals. 4) Their molecules are diatomic.5) Like Halogens, hydrogen can also form both ionic and covalent bond.ExplanationHydrogen:NaH (ionic),CH4 (Covalent)Halogens:NaCl (ionic), HCl6) Both H and Halogens form compound with metals and non-metals.ExplanationHydrogen :H2S [S=non-metal]Halogens : HCl [H = non-metal]DIFFERENCES1) Hydrogen has one electron in valence shell while Halogens has seven electrons.2) Electronic configuration of H = 1S1,Valence shell electronic configuration of Halogens = nS2, nS53) Unlike X- ion, H- ion is unstable in water and reacts in the following manner.ExplanationH- + H2O èH2+ OH-UNIQUE ATOMIC STRUCTURE OF HYDROGEN:Hydrogen is the only element which has no neutron in its nucleus.ConclusionDue to above reasons it is clear that hydrogen cannot be placed in any one of the above mentioned groups.
