Atomic Theory Intro Video

Who first proposed that everything is made up of tiny particles called 'atomos'?

• Democritus

• John Dalton

• J.J. Thompson

• Aristotle

What did John Dalton conclude about the composition of compounds?

• They are made of indivisible particles called 'atomos'.

• They are combinations of atoms of different elements.

• They are filled with negatively charged electrons.

• They are made of four elements: earth, wind, water, and fire.

What did J.J. Thompson discover in 1897?

• The electron

• The nucleus

• The proton

• The neutron

What did Rutherford's gold foil experiment reveal about the atom?

• Atoms are made of four elements.

• Atoms consist largely of empty space with a dense nucleus.

• Atoms are filled with negatively charged electrons.

• Atoms are solid spheres.

According to Niels Bohr, how do electrons move around the nucleus?

• In a straight line

• In fixed orbits at specific energies and distances

• In random paths

• In a zigzag pattern