Chemistry Formulas from Rutherford Atomic Model
·
Radius
of Nucleus, rn = r0 × A1/3
Where, A = Mass Number,
r0
= Proportionality Constant = 1.4 × 10-13 cm
·
Volume
of the nucleus = Approx. 10-39 cm3
·
Volume
of the atom = Approx. 10-24 cm3
·
Density
of the nucleus = 1014 g cm-3
Or,
Important Characteristics of Three
Fundamental Particles
1. Electron
·
Charge
on an Electron = -1.602×10-19 coulombs.
·
Mass
of an Electron = 9.11×10-28 g
·
Specific
Charge (e/m ratio) of electrons (cathode rays) = 1.76×108
coulombs/gram
·
Radius
of the electron = 10-15 cm
·
Density
of the electron = 2.17×1017g/cc
·
Mass
of one mole of the electrons = Approx. 0.55mg
·
Charge
on one mole of the electrons = 96500 Coulombs = 1 Faraday
2. Proton
·
Mass
of Proton = 1.672×10-24g
·
Charge
on Proton = 1.602×10-19 Coulombs
·
Specific
Charge of Proton = 9.58×104 Coulombs/gram
·
Mass
of one mole of proton = 1.007 gram
·
Charge
on one mole of proton = 96500 Coulombs = 1 Faraday
·
Volume
of Proton = Approx. 1.5×10-38cm3
3. Neutron
·
Mass
of Neutron = 1.675×10-24g
·
Specific
Charge on Neutron = 0
·
Density
of Neutron = 1.5×1014g/cc
·
Mass
of one mole of neutron = 1.008g
4. Other Sub-Atomic Particles of Atom
·
Positrons
·
Neutrions
·
Mesons
Chemistry Formulas of Atomic Number (Z)
and Mass Number (A)
·
General
Symbol for an Atom of Element (E) indicating its Atomic Number (Z) and Mass
Number (A)
ZEA
·
Atomic
Number (Z) = Number of Protons = Number of Electrons
·
Mass
Number (A) = Number of Protons + Number of Neutrons
·
No.
of Neutrons = A – Z
