Possible Questions Flashcards
Who put forward the word ‘atom’ to describe the indivisible particles that make up matter?
Democritus
What was Democritus’ contribution to chemistry?
He put forward the name ‘atom’ to describe the indivisible particles that make up matter
Who was the first to put forward an atomic theory?
John Dalton
What was John Dalton’s contribution to chemistry?
He put forward his atomic theory which states;
All matter is made up of very small particles called atoms
All atoms are indivisible. They cannot be broken down into simpler particles
Who discovered cathode rays?
William Crookes
What was William Crookes’ contribution to chemistry?
He discovered cathode rays
Who discovered the electron?
J.J Thompson (using Crookes’ research)
What was J.J Thompson’s contribution to chemistry?
3
He discovered the electron
He calculated the ratio of the charge of the electron to its mass = charge/mass
Put forward the plum pudding model of the atom
Who calculated the ratio of the charge of the electron to its mass?
J.J Thompson
Who determined the size of the charge on the electron?
Robert Millikan
What was Robert Millikan’s contribution to chemistry?
2
He determined the size of the charge on the electron
He calculated the mass of the electron
Who calculated the mass of the electron?
Robert Millikan
Who put forward the plum pudding model of the atom?
J.J Thompson
Who discovered the nucleus?
Ernest Rutherford
What was Ernest Rutherford’s contribution to chemistry?
2
He discovered the nucleus
He discovered the proton
