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☆☆☆☆☆If you add the exact mass of the protons, neutrons, and electrons in an atom you do not get the exact atomic mass of the isotope. The diference is called the mass defect. The difference between the mass of the atomic nucleus and the sum of the masses of the particles within the nucleus is known as the mass defect.
It is n=4 because Br is in the 4p valence shell.
There are three beta decay modes for 40K, and so three equations.
The equation for the negative beta decay of 40K: 1940K --> 2040Ca + -10e
where the -10e represents a beta particle or electron.
The equation for the positive beta decay of 40K: 1940K --> 1840Ar+ 10e
where the 10e represents a positive beta particle or positron.
The equation for the decay of 40K by electron capture is:1940K + -10e --> 1840Ar + ve
The half-life should be similar to the age of the object.
F=v/&
its nucleus is unstable
4.5 × 1015 J
it produces dangerous waste. apex
the velocity of the wave -apex
∆G = ∆H - T∆S∆G = 27 kJ/mole - (500 deg)(0.09 kJ/mol-deg)
∆G = 27 kJ/mole - 45 kJ/mole
∆G = - 18 kJ/mole (Note the minus sign indicating the process is spontaneous)
