The plum pudding model was devised by JJ Thomson in 1904. He believed that the atom was a dense sphere of positively charged matter (pudding) with electrons burried inside (plums in the pudding.)
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What range does alpha radiation have in air?
A couple of cm.
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What is an isotope?
Isotopes are atoms of the same element with different numbers of neutrons.
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What is the mass number?
The mass number is the number of protons and neutrons in a nucleus.
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What is the atomic number?
The atomic number is the number of protons in a nucleus. (Hence, the number of electrons as well.)
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