Atom

• Who created atomism theory?

  Democritus
• What was the theory democritus called atomism
• John dalton was the person who made a more and better precise atom image
• Elements are made up of extremely small particles called the Atom
• Atoms of one element combine with atoms of another

  element to form compounds
• A chemical reaction does not result in the creation or

  destruction of atoms. A chemical reaction results only in

  the separation, combination, or rearrangement of

  atoms.
• Sir Joseph John Thomson

  (JJ Thomson), an English physicist,

  discovered the presence of smaller

  particles inside the atom.
• The negatively-charged

  subatomic particles were called

  electrons.
• JJ Thomson proposed the plum

  pudding model of the atom.
• Ernest Rutherford performed a gold foil experiment.
• Atoms are made up of smaller particles called

  subatomic particles.
• There are three types of subatomic particles that make

  up an atom: protons, neutrons, and electrons.
• Protons have a positive charge, neutrons have no charge,

  and electrons have a negative charge.
• In the gold foil experiment of Ernest Rutherford, most of

  the alpha particles passed through the gold foil, but some

  were deflected and bounced back, True or False? True
• In Rutherford’s nuclear model, an atom has a dense

  central core called the nucleus, which contains positive

  charges, True or False? True
• Dalton proposed the idea that the atom is a uniform

  positively charged sphere embedded with electrons. True or False? True
• 3 examples of compound are CO2, Oxygen, and Nitrogen
• What is the greek word of indivisible? Atomos
• When democritus said that the greek word of indivisible was atomos, that theory was proven to be called Atomism
• JJ Thomson’s cathode-ray tube experiment allowed him to

  discover the electron, in which he used to propose the

  plum pudding model where an atom is presented as a

  uniform positively charged sphere embedded with

  electrons.
• Ernest Rutherford performed the gold foil experiment,

  which results to the discovery of the nucleus, a dense

  central core where protons and neutrons are located.
• Ernest Rutherford developed the nuclear model of

  an atom