C4a atomic structure 0.0 / 5 ? ChemistryAtomsGCSEOCR Created by: WiktoriaGrudzinskaCreated on: 29-12-15 21:01 what is the radius and the mass of an atom ? radius - 1x10^-10 and the mass of an atom is 1x10^-23 grams 1 of 13 what is the atomic number of an atom mean ? the number of protons in an atom 2 of 13 why are all atoms nuetral ? protons and electrons charges cancel each other 3 of 13 what is the mass number of an atoms mean ? the total number of protons and nuetrons together 4 of 13 what is an isotope ? an atom with the same number of protons but different number of nuetrons 5 of 13 how are elements arranged in the periodic table ? they'e in groups starting from to 1-8 and periods starting from 1-8 6 of 13 what does the group number tell you about an atom ? the amount of electrons in the outer shell 7 of 13 what does the period number tell you about an atom ? amount of shells in the atom 8 of 13 describe how electrons are arranged in a shell 2 electrons in first shell and maximum of 8 in the rest 9 of 13 what is an ion ? an ion with a positive/negative charge 10 of 13 how are positive and negative electrons formed ? when an atom loses or gains electrons to become positive or negative 11 of 13 why is Dalton, J.J Thomson, Rutherford and Bohr important in the development of the theory of atomic structure ? Dalton model was an individual atom. J.J Thomson discovered the electron. Rutherford discovered the nucleus 12 of 13 describe how unexpected results from Geiger and Marsdens experiment led to the theory of a nuclear atom ? the unexpected results uncovered a nucleus with the atom 13 of 13
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