BMAT – Chemistry Exam Questions and Answers
Atom structure Protons and neutrons in the nucleus Electrons arranged around the nucleus in shells Overall charge is zero - atom is neutral Proton relative charge 1+ positive Neutron relative charge 0 Electron relative charge 1- negative Proton relative mass 1 Neutron relative mass 1 Electron relative mass 1/1836 What do atoms of the same element contain? same number of protons Atomic number number of protons How does the periodic table arrange elements? By atomic number Isotopes Atoms of the same element with the same number of protons but different numbers of neutrons and different masses Mass number total number of protons and neutrons in an atom Isotopes and chemical reactions Different isotopes of the same element have the same number of electrons Number of neutrons has no effect on reactions
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