An element A has a valency of 1 while another element has a valency of 2. Give the formula of their compound formed when A reacts with B. Derive as per rules.Immersive Reader (2 Points)
Answers
Answer:
oxidation state of elemnet = 1
oxidation state of element =2
chemical formula when A reacts with B=A2B
Answer- The above question is from the chapter 'Metals and Non-metals'.
Valency: Valency is the combining capacity of an atom of an element.
The number of valence electrons help in determining valency.
Examples:
Sodium (Na) has atomic number 11 and its electronic configuration is 2, 8, 1.
Since Na can easily lose 1 electron to attain stability, it has valency +1. Thus, it is electropositive and is a metal.
Fluorine (F) has atomic number 9 and its electronic configuration is 2, 7.
Since F can easily gain 1 electron to attain stability, it has valency -1. Thus, it is electronegative and is a non-metal.
Metals have 1, 2, 3 as valent electrons. Therefore, their valency is +1, +2 and +3.
Non-metals have 5, 6, 7 as valent electrons. Therefore, their valency is -3, -2, -1. (Case is different for non-metals like: Carbon with tetravalency.)
Metals and non-metals form ionic bonds. The formulae of ionic bonds between them can be made by criss-cross method.
Given question: An element A has a valency of 1 while another element has a valency of 2. Give the formula of their compound formed when A reacts with B. Derive as per rules.
Answer: Valency of A = 1
Valency of B = 2
A B
1 2
By criss-cross method,