where the mass of an atom is concentrated
the nucleus
charge of an atomic nucleus
positive
what holds an atom together
electrostatic attraction
deflection of electrons in an electric field
very easily away from negative plate, towards the positive plate
why is an electron easily deflected
have a very small mass
deflection of protons in an electric field
away from positive. towards negative
why are protons deflected less than electrons
protons are heavier than electrons
deflection of neutrons in an electric field
none at all
proof of subatomic particles charge
deflection in an electric field
ions are
charged
formation of an ion
either gain or loss of electrons
atomic (proton) number is the same as
the number of protons
calculation of number of protons
mass number - number of neutrons
a neutral atom has the same numbers of
protons and electrons
a positive ion has
lost electrons
fewer electrons than protons
a negative ion has
gained electrons
more electrons than protons
formula for number of neutrons
mass number - number of protons