Test Flashcards
Atom
Smallest particle of an element
What did Democritus think about atoms
Why did it not work out
They were invincible and indestructible
Bc they didn’t know how it would cause a chemical reaction and it lacked scientific experiment
Dalton’s atomic theory
First theory to base off atoms making chemical reactions
All elements are made up of atoms
One elements atoms are different from another element
Atoms of different elements can mix together
Atoms can’t change into another element, only joined or separated
Subatomic particles
Protons
Neutrons
Electrons
Who discovered electrons
J.j Thompson
Electrons
Negative subatomic particles
Protons
Positively charged subatomic particles found in the nucleus of an atom
Neutrons
subatomic particles with no charge but mass same number as protons
Nucleus
Center of atom, filled with protons and neutrons
“Elements are different because they contain different numbers of protons”
F
Atomic number
The number of protons in the nucleus of the atom
Isotopes
Atoms with same number of protons but not neutrons different mass numbers
