scientists
This Greek philosopher proposed that everything was made of tiny, indivisible particles.
Who is Democritus
This model is also known as the billiard ball model.
What is Dalton’s model?
He revealed the existence of the electron.
Who is J.J. Thomson?
In what year did Dalton produce his scientific model of the atom?
What is 1803?
This is the approximate charge of an electron.
What is 1.6 × 10⁻¹⁹ C?
This scientist proposed the first scientific model of the atom in 1803.
Who is John Dalton?
This model is often called the plum pudding model.
What is Thomson’s model?
He discovered the nucleus of the atom.
Who is Ernest Rutherford?
In what year did Thomson reveal the electron?
What is 1897?
This is the approximate mass of an electron.
What is 9.1 × 10⁻³¹ kg?
This scientist discovered the electron in 1897.
Who is J.J. Thomson?
Dalton believed that elements were made of these.
What are different types of atoms?
He discovered the neutron.
Who is James Chadwick?
In what year did Millikan conduct his famous oil-drop experiment?
What is 1910?
This is Avogadro’s number.
What is 6.022 × 10²³?
This scientist discovered the neutron in 1932.
Who is James Chadwick?
According to Democritus, atoms were what?
What are tiny, indivisible particles?
He became the first man to split the atom.
Who is Ernest Rutherford?
In what year did Chadwick discover the neutron?
What is 1932?
This scientist distinguished between atoms and molecules and formulated the law relating gas volume to number of molecules.
Who is Amedeo Avogadro?
This scientist calculated Avogadro’s number in 1909.
Who is Jean Perrin?
put these models/discoveries in chronological order: Thomson’s electron, Dalton’s model, Chadwick’s neutron, Democritus’s atomic idea.
Democritus → Dalton → Thomson → Chadwick
This scientist determined the charge of an individual electron and later its mass.
Who is Robert Millikan?
Which came first: Avogadro’s law (1811) or Thomson’s discovery of the electron (1897)?
What is Avogadro’s law?
This law states that equal volumes of gases at the same temperature and pressure contain the same number of molecules.
What is Avogadro’s law?