Valency

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Valency: Overview

This topic covers concepts, such as, Valency, Valencies of Noble Gases, Octet Rule, Calculation of Valency of Elements & Valency of the First 18 Elements etc.

Important Questions on Valency

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Can all elements form both electro valency and covalency?

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How do we find the valency of the elements in a compound, if three elements are present in a compound eg NaAlO2

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Give some elements having valency 2.

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Write the definition of valency.

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The valency of oxygen is 3 in the water molecule.

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The valency of oxygen in water is :

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What is the general name of the elements having 8 electrons in the valence shell of their atoms?

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Choose from the following list, as to what matches the descriptions below:

A O2-  B O2  C NH4+ D OH-  E H2O  F NH4Cl  G HCl   HCa2+  I MgO   J Ca2+

A cation whose electronic configuration resembles argon.

Enter your answer as A, B, C, D, E, F, G, H, I or J

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Give reasons for the following : 

Noble gases show least reactivity. 

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Find out the valency of the atoms represented by the figure.

Question Image

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Match the column I with column II and select the correct answer by choosing an appropriate option.

Column I Column II
P. Fractional atomic weight 1. Hydrogen
Q. A=Z for 2. Chlorine
R. Variable valency 3. A-Z
S. Number of neutrons 4. Cu+, Cu2+

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The valency shown by an element having atomic number 16 is

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An element X (atomic no. =12) combines with another element Y whose electronic configuration is 2, 8, 7. What will be the formula of the compound formed?

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How will you find the valency of aluminium, oxygen and fluorine? 

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What is the cause of the chemical combination? How is the number of valence electrons related to the combining capacity of the atom?

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How do we calculate the valency of ions?

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Define valency by taking an example of magnesium (Atomic number 12) and oxygen (Atomic number 8).

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The electronic configuration of O(Z = 8) is 2, 6. Why is the valency of oxygen 2 and not 6
 

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Define valency. What conclusions can be drawn about the reactivity of an atom from its valency?