Flashcards in 4.2 The Atom Deck (11):
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
atomic mass unit
a unit of mass used to express atomic and molecular weights
a subatomic particle of about the same mass as a proton but without an electric charge
the number of protons in a nucleus
an atom that has the same number of protons
the sums of the numbers of protons and neotrons
the mass of an atom expressed in atomic mass units
is the force that attracts any object with mass.
when opposite attract each other
when protons push away from each other.