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p4 (isotopes and nuclear radiation (Alpha (they do not penetrate far into…
p4
isotopes and nuclear radiation
Alpha
they do not penetrate far into the materials for example paper could stop it and only travels a few cm in air
strongly ionising
a helium nuclei 2 protons 2 nuetrons
Beta
fast moving electron no mass but a charge of -1
moderately ionise
can travel a few m in the air and absorbed by a sheet of aluminum
isotopes are different forms of the same element
isotopes have added neutrons
this means that the overall charge does not change but the mass does
Gamma
Em waves
penetrate into a lot of materials and will travel long distance
can be aqbsorbed by lead and concrete
Developing the model of the atom
this model has since developed into the current atom model
the current model is split into two parts and further divide into three sub atomic particles
the nucleus holds most of the mass in the atom
atoms are made up of protons neutrons and electrons
Rutherford replaced the plum pudding model with the nuclear
in 1900 jj thompson discovered electrons
then after the plum pudding model was created
in 1909 rutherford disproved this by dong the alpha particle scattering experiment
this was now the first nuclear model of the atom
Half Life
half life is how long it takes for a radioactive matter to deteorate
radioactivity is a totally random process