Atoms Flashcards
The smallest unit of an element that maintains the properties of that element
Atom
a subatomic particle that has negative charge
electron
in physical science, an atom’s central region, which is made up of protons and neutrons
nucleus
a region around the nucleus of an atom where electrons are likely to be found
electron clouds
a subatomic particle that has a positive charge and that is found in the nucleus of an atom
protons
a unit of mass that describes the mass of an atom or moleucle
atomic mass unit
a subatomic particle that has no charge and that is found in the nucleus of an atom
neutrons
the number of protons in the nucleus of an atom the atomic number is the same for all atoms of an element
atomic number
an atom that has the same number of protons as the other atoms of the same element do but that has a different number of nutrons
isotopes
the sum of the numbers of protons and neutrons in he nucleus
mass number
the mass of an atom expressed in atomic mass units
atomic mass
He experimented with different substance to see if hydrogen and oxygen could combine.
John Dalton
He found that their was a mistake in Dalton theory
Thomson
He experiment with Thomson theory
Rutherford
Bohr was a danish scientist who worked with Rutherford
Bohr
