Hydrogen

(1) The position of the hydrogen in periodic table

Hydrogen is the first element in the periodic table. Hydrogen is not placed in specific group due to its property of giving electron (When  is formed) and also losing electron (When is formed).

(i) Hydrogen is their in group I (Alkali metals) as, 

(a) It has one electron in its outer shell- 1s¹ like other alkali metals which have (inert gas) ns¹ configuration.

(b) It forms monovalent H⁺ ion like Li⁺, Na⁺

(c) Its valency is also 1.

(d) Its oxide (H₂O) is stable as Li₂O, Na₂O.

(e) It is a good reducing agent (In atomic as well as molecular state) like Na, Li....

(ii) Hydrogen also resembles halogens (Group VII A) as,

(a) It is also diatomic (H₂) like F₂, Cl₂....

(b) It also forms anion H^- like F^-, Cl^-...... by gain of one electron.

(c) H^- has stable inert gas (He) configuration as CH₄, C₂H₆ like halogens CCl₄, SF₂Cl₂ etc.

(d) Hydrogen(H) is one electron short of duplet (Stable configuration) like F, Cl.... which are also one electron deficient than octet, F - 2s²2p⁵; Cl- 3s²3p⁵.

(e) (IE) of H (1312 KJ mol^-1) is of the same order as that of halogens.

(iii) (IE) of H is very high in comparison with alkali metals. Also size of H⁺ is very small compared to that of alkali metal ion. H forms the stable hydride with strongly electropositive metals only due to smaller value of its electron affinity (72.8 KJ mol^-1).

(iv)Tthe anomalous behaviour of the hydrogen, it is difficult to assign any specific position to it in the periodic table. Therefore it is customary to place it in group I (Along with the alkali metals) as well as in the group VII  (Along with the halogens). 

(2) Discovery and occurrence: It was discovered by Henry Cavendish in the year 1766. Its name hydrogen was given by the scientist Lavoisier. It is the 9^th most abundant element on the earth's.

Hydrogen exists in the diatomic state but in the triatomicstate it is known as Hyzone. The systematic name of the water is oxidane.

Email based Chemistry assignment help - homework help at Expertsmind

Are you searching chemistry expert for help with Hydrogen and its Compounds questions?  Hydrogen and its CompoundsX topic is not easier to learn without external help?  We at www.expertsmind.com offer finest service of Chemistry assignment help and chemistry homework help. Live tutors are available for 24x7 hours helping students in their Hydrogen and its Compounds related problems. We provide step by step Hydrogen and its Compounds question's answers with 100% plagiarism free content. We prepare quality content and notes for Hydrogen and its Compounds topic under chemistry theory and study material. These are avail for subscribed users and they can get advantages anytime.

Why Expertsmind for assignment help

1. Higher degree holder and experienced experts network
2. Punctuality and responsibility of work
3. Quality solution with 100% plagiarism free answers
4. Time on Delivery
5. Privacy of information and details
6. Excellence in solving chemistry queries in excels and word format.
7. Best tutoring assistance 24x7 hours