SC3a Structure of the Atom Flashcards
atomic theory by Dalton? 4
~all matter is made up of tiny particles called atoms
~atoms are tiny spheres that cannot be broken down into smaller parts
~atoms cannot be created or destroyed
~atoms in an element are identical but each element has its own type of atom
who came up with the atomic theory?
John Dalton
what did J.J. Thomson discover about the atom?
atoms made up of even smaller particles called sub atomic containing protons, neutrons and electrons
description of Daltons atom model
solid sphere called a billiard ball model
description of Thompsons atom model
~solid positive sphere with negative particles inside
~Thomson’s plum pudding model
description of Rutherford’s atom model
~nuclear atomic model
~positive nucleus with negative particles around it on overlapping hoop things
relative charge of each subatomic particle
proton ~ +1
electron ~ -1
neutron ~ 0
relative mass of each subatomic particle
proton ~ 1
electron ~ 1/1835 (negligible)
neutron ~ 1
what is a molecule?
two or more atoms chemically joined
what tiny particles flow in an electric current?
electrons
