radiation Flashcards
what subatomic particles are there
proton neutron and electrons
what is the size of the atom
10 to the power minus 10
what is the structure of the atom
a tiny nucleus 10,000 times smaller than the atom containing protons (+) and neutrons(0), with electrons(-) orbiting in shells at different distance from the nucleus
what is the plum pudding model
an old model of the atom describing it as a ball of positive charge with negative electrons spread throughout
what did the Greeks think the atom was
tiny spheres that could not be divided
what was discovered to lead to the plum pudding model
electrons
who came up with the nuclear model
Rutherford
what did Rutherford do
the alpha scattering experiment
who adapted the nuclear model to suggest that electrons orbited the nucleus at specific distances
Neils Bohr
what are the two numbers associated with elements on the periodic table
the smaller number is the atomic number (the number of protons) the bigger number is the mass number (protons + neutrons)
what did James Chadwick provide evidence for
neutrons in the nucleus
what is an isotope
some atoms have the same number of protons but different numbers of neutron they are chemically the same element but will have different sabilities
what is an ion
atoms have the same number of protons and electrons ions have different numbers so are charged
