What is metallurgy?
The science of producing and using metals
What did Aristotle propose?
All matter is composed of combinations of: Fire Earth Water Air
What did Democritus propose?
Matter is made up of tiny particles (ATOMS) that cannot be divided into smaller pieces.
What did Boyle conclude?
Gases are made of tiny particles that group together to form different substances.
What did Antoine Lavoisier discover?
Law of conservation of mass: mass can neither be created nor destroyed.
What did John Dalton discover?
All matter is made of small particles (atoms). Atoms of an element are identical in size and mass. Atoms of different elements have different properties. Atoms combine in specific ratios to form new substances.
What model did John Dalton introduce?
What did J.J. Thomson discover?
Existence of electrons.
What model did J.J. Thomson introduce?
Raisin bun model Atoms are positively charged spheres with embedded negative charges.
What did Ernest Rutherford discover?
What model did Ernest Rutherford introduce?
The nuclear model. Each atom has a positively charged core.
What did Niels Bohr discover?
Electrons surround the nucleus in specific energy levels.
What model did Bohr introduce?
Bohr's model: bull's eye model.
What is "today's" model?
Quantum Mechanical Model.
What does the Quantum Mechanical Model show?
Electrons are a cloud of negative charge.