ATOMIC STRUCTURE
ATOM
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.
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.
CHARACTERISTICS
OF ELECTRON
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.
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.
CHARACTERISTICS
OF PROTON
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CHARACTERISTICS
OF NEUTRON
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.
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.
ATOMIC
NUMBER
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MASS
NUMBER
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". | |
SYMBOL
OF NUCLEUS
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.) A= mass number. Z= atomic number. 1H1, 11Na23, 17Cl35, 7N14, 13Al2 |
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