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atoms and Molecules - Coggle Diagram
atoms and Molecules
ion
It is an electrically charged atom or group of atoms. It is formed by the loss or gain of one or more electrons by an atom.
i) Cation: It is positively charged ion and is formed by the loss of one or more electrons from an atom
(ii) Anion: It is a negatively charged ion and is formed by the gain of one or more electrons by an atom.
representation
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ii) For a compound made up of a metal and a non-metal, the symbol of metal is written first.
iii) In compounds formed with polyatomic ions, the ion is enclosed in a bracket before writing the number to indicate the ratio.
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atomic mass
Atomic mass of an element may be defined as the average relative mass of an atom of the element as compared with the mass of an atom of carbon (C-12 isotope) taken as 12 amu.
Molecules
A group of two or more than two atoms of the same or different elements that are chemically bonded together is called a molecule.
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Molecular mass
The number of times a molecule of a compound is heavier than the 1/12 of the mass of C-12 atom, is known as its molecular mass.
The molecular mass is equal to the sum of the atomic masses of all atoms present in one molecule of the substance.
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