Q. An element X(atomic no 11) combines with another element Y (atomic no 17).
The formula of the compound formed is-
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Answers
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We know that Na or Sodium has atomic number 11
and Cl has the atomic number 17 so the compound will be NaCl
Answer- The above question is from the chapter 'Metals and Non-metals'.
Concept used: 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 X (atomic no 11) combines with another element Y (atomic no 17). The formula of the compound formed is-
Answer: For element X, atomic number = 11
Electronic configuration = 2, 8, 1
Valency = 1
For element Y, atomic number = 17
Electronic configuration = 2, 8, 7
Valency = 1
X Y
1 1
By criss-cross method,