Ancient greeks and their beliefs about atom Flashcards
Who believed that AIR is the primary substance of everything
Anaximenes
Who believed that FIRE is the primeval substance
heraclitus of ephesus
Who believed that “nothing comes from nothing”
he conceptualize that all matter is made from earth, water, wind and fire
empedocles
Who believed that “something new could not be made from nothing and changes are due to rearrangement of atoms”
he is the teacher of democritus
leucippus
he believed that eveything was made from the four qualities : hot, cold, wet and dry
aristotle
created periodic table of elements
mendeleev
discovered radioactivity which earned him a nobel prize
henri becquerel
used the gold foil experiment to discover the modern model of an atom
ernest rutherford
he explained that outer orbits in an atom could hold more electrons than inner orbits. he also gave birth to the idea that electrons emit light by jumping orbits
neils bohr
he discovered positive particles. he noted that particles had a charge equal and opp to the electron
eugene goldstein
he discovered the electron. he experimented by testing and studying the nature of electric discharge in a high vacuum cathode-ray tube
j.j thomson
he used oil drop experiment to determine the charge of a single electron
millikan
he came up with the concept of isotopes. explain with ernest rutherford that radiation is due to transmutation of elements
fredrick soddy
he is the father of modern science because of his way of thinking
democritus
he made experiments with gases to study atoms
john dalton
he experimented on the cathose ray tubes (CRT)
eugen goldstein
according to these greek philosophers, they thought that you will eventually reach the point where you can no longer divide an object in half
leucippus and his pupil democritus
he dicovered the plum pudding model
jj thomson
they discovered that nucleus of an atom
hans geiger and ernest rutherford
he bombarded nitrogen atoms with alha particles producing hydrogen ions
ernest rutherford
he proposed that the nucleus also contained particles with neutral charge
ernest rutherford
he proposed that electrons move in orbits around the nucleus but only orbits of certain radi are allowed
neils bohr
who developed the quantum mechanical model
erwin schrodinger and werner heisenburg
it is the building blocks of a matter
atom
