Science (Atomic Theory and The Development of the Periodic Table

Who proposed protons?

Who proposed Electrons?

Who proposed Neutrons?

are made up of subatomic particles namely, protons and neutrons, and electrons.

it is the center of the atom.

he said that all atoms are small, hard particles.

"atomos" is a Greek Word for:

He proposed that atoms

were made of a single

material formed into

different shapes and sizes.

proposed that elements (substances composed of only one type of atom) combine in certain proportions to form compounds.

he made the Solid Sphere Model or Bowling Ball Model