Please enable JavaScript.
Coggle requires JavaScript to display documents.
Atoms - Coggle Diagram
Atoms
Basics
Atomic number= number of protons
Mass Number= protons + Neutrons
Protons have a positive charge
Neutrons have no charge
Electrons have a negative charge
Isotopes- Same atomic number with different number of neutrons
Nuclide- nucleus of any given element
Atomic mass unit- 1/12th of a carbon-12
Atomic mass- Weighted average of all the isotopes of an element
Famous scientists
Democritus
First to suggest atoms as building blocks of matter
Atomos = "Indivisible"
John Dalton
Dalton's Atomic theory
Atoms are in everything
Atoms of the same element are identical
Atoms can combine with other atoms in simple ratios
Chemical reactions rearrange the atoms, but don't change their identity
J.J. Thomson
Used a cathode ray tube to find the electron
Ernest Rutherford
Gold foil experiment
Found a massive area in the center of the atom
Laws
Law of Conservation of Mass
Mass cannot be created or destroyed
Law of Definite Proportions
A compound always contains the same elements in the same proportion by mass
Law of Multiple Proportions
The same two elements can be in multiple compounds, but they must combine in different rations