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To construct the formulas of ionic compounds, we must first understand the valencies of the positive and negative ions that combine to produce the ionic compounds. As a result, we’ll start with ion valencies. The valency of an ion is equal to its charge. If an ion has one unit charge, its valency is one, and it is referred to as a monovalent ion. When an ion contains two units of charge, its valency is two, and it is referred to as a divalent ion. And if an ion has three units of charge, its valency is three, and it is referred to as a trivalent ion. Please keep in mind that a cation has a positive charge and so has positive valency; an anion has a negative charge and thus has negative valency.

Radical behaves like a single atom with a positive or a negative charge on it, they are defined as an atom or a group of atoms of the same or different elements that shows the nature of the atom with charge on it. they have their own combining power due to their combining capacity they form chemical formulae.

For Example:

NH4+, Na+, NO3−, SO42−

Rules for writing of electrons configuration in different shells for the first 18 elements are formula to calculate the maximum number of electrons present in a shell = 2n2, where n = 1, 2, 3 (i.e. orbit number).

For different shells maximum electrons distributes as,

The valency of charged ions or radicals is equal to the amount of charge present on them. On the basis of charge present on radicals or ions, they are divided into three:

Following is the tabular representation of common monoatomic cations:

Following is the tabular representation of common monoatomic anions:

Following is the tabular representation of common polyatomic radicals:

Question 1: Find the number of atoms present in an H2S molecule and a PO43- ion.

Answer:

Question 2: Calculate the molecular mass of each species given as,

H2O, Cl2, CO2 and CH4

Answer:

Question 3: What are polyatomic ions? Give examples.

Answer:

Question 4: Write the formulae of Sodium oxide and Aluminum chloride.

Answer:

Question 5: If 1 mole of carbon (C) atoms weighs 12 grams, what will be the mass of 1 atom of carbon?

Answer: