re-take Flashcards
(29 cards)
what is an atom?
smallest piece of an element
correct order in which the subatomic parts of an atom were discovered
electron> proton>neutron
what type of charge does a nucleus have?
no charge
two subatomic particles make up the mass of the atom
electrons and neutrons
how do you calculate the number of neutrons in an atom?
mass number minus atomic number
where in the atom are the electrons located?
outside nucleus
who discovered electrons?
J.J Thomson
who discovered protons?
Rutherford
the average mass of an elements isotopes, weighted according to the abundance of each isotopes
atomic weight
what type of charge do proton subatomic particle have
positive
the subatomic particles that are considered the identity of the atom
protons
how many protons, neutrons, and electrons are in nitrogen?
7
what type of charge do electron subatomic particle have?
negative
who discovered nucleus?
Rutherford
classification system for elements is called
periodic table of elements
what is the study of matter?
chemistry
the abbreviation for an element
elements symbol
who invented the simplified version of an atom?
John Dalton
the scientist who invented the classification system for the elements
demitree mende
based on the number of protons in the nucleus of the atom
atomic number
who used the gold foil experiment to confirm the presence of a nucleus in an atom
Rutherford
all matter is made of
atoms
what was the name of j.j thomson
plum model
this model stated that electrons travel around the nucleus of an atom in orbits or definite paths
planetary model
