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ICSE Class 7 Answered

what are chemical formulas
Asked by asbelhelcar21 | 07 Aug, 2019, 12:57: PM
answered-by-expert Expert Answer

Chemical Formula

                It is the representation of a substance by means of symbols. It denotes the number of atoms of each element present in a compound.

 

Substance

Symbol

No. of atoms of each element present

Chemical formula

Sodium chloride

Na [sodium],

Cl [chloride]

1 atom of Na,

1 atom of Cl

NaCl

 

  • Method of writing the chemical formula

    To write a chemical formula, you should know

1)    Symbol of the element/radical

2)    Valency of the element/radical

  • Step I    - Write each symbol with its valency
  • Step II   - Interchange the valencies
  • Step III  - Write the interchanged number and the formula
Answered by Ramandeep | 08 Aug, 2019, 10:39: AM

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