ATOMIC
STRUCTURE
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ATOM
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Smallest
particle of an element which shows all properties of element is called atom. Some characteristics of "atoms" are as follows: Atom takes part in chemical reactions independently. Atom can be divided into a number of sub-atomic particles. Fundamental particles of atom are electron, proton and neutron. |
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CHARACTERISTICS
OF ELECTRON
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1. Charge: It is a negatively charged particle. 2. Magnitude of charge: Charge of electron is 1.6022 x 10-19 coulomb. 3. Mass of electron: Mass of electron is 0.000548597 a.m.u. or 9.11 x 10-31 kg. 4. Symbol of electron: Electron is represented by "e". 5. Location in the atom: Electrons revolve around the nucleus of atom in different circular orbits. |
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CHARACTERISTICS
OF PROTON
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For latest information , free computer courses and high impact notes visit : www.ChemRun.blogspot.com | |||
CHARACTERISTICS
OF NEUTRON
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1.
charge: It is a neutral particle because it has no charge. 2. Mass of neutron: . Mass of neutron is 1.0086654 a.m.u. Or 1.6749 x 10-27 kg. 3. Comparative mass: Neutron is 1842 times heavier than an electron. 4. Location in the atom: Neutrons are present in the nucleus of an atom. |
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ATOMIC
NUMBER
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Total
number of protons present in the nucleus of an atom
is called "Atomic number" or "Charge number" |
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Since the total number of protons and the total number of electrons in an atom are equal therefore atomic number may also be defined as: | |||
"Total
number of electron in an atom is called Atomic number"
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SYMBOL: It is denoted by "z". | |||
MASS
NUMBER
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Total
number of protons and neutrons present in the nucleus of an atom is called
"Mass number".
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SYMBOL: It is denoted by "A". | |||
A
= p + n
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SYMBOL
OF NUCLEUS
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A nucleus is represented by the symbol : |
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zXA
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Where
X= symbol of element (Cl, O, H , Na etc.) |
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For latest information , free computer courses and high impact notes visit : www.ChemRun.blogspot.com |
Really helpful
ReplyDeleteThanks lot for the helpful information
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