Atom
It was discovered by J.J. Thomson in 1886
Neutrons
Structure of an Atom
Cathode Rays travel in straight lines
Cathode Rays can cause motion
Cathode Rays carry negative charge
Mass number of carbon atom
Valence electrons
Valence shells
Alkali Metal . | Atomic Number | Electronic configuration | Number of Valence Electrons |
Lithium (Li) | 3 | 2,1 | 1 |
Sodium (Na) | 11 | 2,8,1 | 1 |
Potassium (K) | 19 | 2,8,8,1 | 1 |
Valence electrons of different elements
Isotopes of Chlorine
Isotopes of hydrogen
Isotopes of hydrogen
Isobars | Atomic number(Z) | MassNumber(A) | Electrons(e) | Proton(p) |
40 Ar18 | 18 | 40 | 18 | 18 |
40 K 19 | 19 | 40 | 19 | 19 |
40 Ca 20 | 20 | 40 | 20 | 20 |
Isotones | Atomic number(Z) | MassNumber(A) | Electrons(e) | Proton(p) | Neutron(n) |
14C6 | 6 | 14 | 6 | 6 | 8(14-6) |
15N7 | 7 | 15 | 7 | 7 | 8(15-7) |
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