1.how to make a chemical formula. 2.how to make a valency.?

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{1}- *Memorize the prefixes for number of atoms. ... *Write the chemical symbol for the first element. ...* Add the number of atoms as a subscript. ... *Write the chemical symbol for the second element. ...* Add the number of atoms present as a subscript. ...* Practice with some examples. {2}- the  valency  is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the  valency.

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Chemical formula is made by Criss crossing the metal (symbol) with their respective Valencia. Valency is the no of electrons which can be gained or lost by valence shell

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To make a chemical formula firstly you need to know the symbols of the elements and their valency through valency table write the symbols and then valency of the first on the base of the second and valency of second on the base of the first

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1. How to Make a Chemical Formula
To create a chemical formula, follow these steps:
- Identify the Elements
Determine which elements are involved in the compound. Each element has a unique symbol (e.g., H for hydrogen, O for oxygen).
- Determine the Number of Atoms
Find out how many atoms of each element are present in the compound. For instance, in H2O, there are 2 hydrogen atoms and 1 oxygen atom.
- Use Subscripts
Write the chemical symbols with appropriate subscripts to indicate the number of atoms. If there's only one atom of an element, no subscript is needed. For example, CO2 indicates one carbon atom and two oxygen atoms.
- Combine Elements
Arrange the elements in a conventional order (usually metals first, followed by non-metals), and ensure the formula reflects the correct proportions of the elements.
- Check for Ionic Compounds
For ionic compounds, ensure that the net charge is neutral, balancing the positive and negative charges from the ions involved.
2. How to Make a Valency
Valency refers to the ability of an atom to bond with other atoms. To determine the valency:
- Identify the Group Number
Locate the element on the periodic table. The group number determines the number of valence electrons. For example, Group 1 elements have a valency of +1.
- Determine Electron Configuration
Understand the electron configuration to see how many electrons are needed to fill the outer shell. This helps in determining the valency (e.g., oxygen has 6 valence electrons and needs 2 more to complete its shell, so its valency is -2).
- Consider Common Valencies
Familiarize yourself with common valencies of elements. For instance, carbon typically has a valency of 4, while chlorine has a valency of -1.
- Use Oxidation States
Learn about oxidation states, which indicate the degree of oxidation of an atom in a compound. This can also help in identifying the valency.
By understanding these concepts, you can effectively create chemical formulas and determine valencies for various elements and compounds.

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How to make chemical formula?

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