Theories about the composition of matter date back to the ancient Greeks. In about 450 BC, Democritus theorized that matter consisted of átomos (means uncuttable), or atoms. Modern realization of atomic theory began in 1661 when Robert Boyle therorized that there was an end to the ability of chemistry to break down substances (he called atoms "corpuscules"). Up to that point, classical chemists thought substances were formed from combinations of the 4 classical elements: air, earth, fire, and water. Then, in 1789 the term "element" was defined by the Frenchman Antoine Lavoisier to mean basic substances that could not be further broken down by the methods of chemistry. From there, John Dalton proposed that gases were made of individual particles that could combine to form unique compounds. By 1905, the existence of atoms was pretty much universally accepted when Einstein published his papers on Brownian motion (random motion due to the energy in atoms). Sorry, but atoms were never really just "found", they were gradually noticed over centuries, and now it's accepted as the best explanation for what we can see.
1. Some Indian thinkers supposed the existence of atoms 2 600 years ago.
2. Separately, in Europe, Leucippus and Democritus supposed the existence of atoms 2 500 years ago.
3. The same supposition in the Middle Age by John Boyle.
4. John Dalton founded the modern atomistic theory in 1805.
But many philosophers, chemists and physicists worked during a long history to establish the today knowledge about atoms; see the link below.
manu
Robert Boyle
Democritus did not have experimental evidence to support his idea of the atom. Instead, his idea was based on philosophical reasoning and speculation.
Democritus, an ancient Greek philosopher, was the first person to introduce the idea of an atom. He proposed that all matter is made up of tiny indivisible particles called atoms. Democritus' atomic theory laid the foundation for the modern understanding of atoms.
The idea of atoms was first introduced by the ancient Greek philosopher Democritus in the 5th century BC. Democritus proposed that all matter is made up of tiny, indivisible particles that he called "atomos," meaning "uncuttable" in Greek.
democritus
450 b.c
Its RADIOACTIVITY!! That was the first discovery that rejects the idea that the atom is indestructible
manu
The idea of the atom was first developed by Greek philosophers Leucippus and Democritus in 5th century BC. Their idea was overlooked until Antoine Lavoisier's experiments were done in the 18th century.
ryan falcone
dylan narvadez
The idea of the atom was first proposed by the ancient Greek philosopher Democritus in the 5th century BCE. He suggested that all matter is made up of indivisible particles called atoms, which differ in size, shape, and arrangement.
The idea that the atom is mostly empty space was first proposed by Ernest Rutherford based on his gold foil experiment in 1909. This experiment led to the discovery that most of an atom's mass is concentrated in a nucleus at the center, surrounded by electrons in vast empty space.
The idea of the atom was first proposed by the ancient Greek philosopher Democritus in the 5th century BC. He believed that everything is made up of tiny, indivisible particles called atoms.
The ancient Greek philosophers Lefhipus and Dimokritus were the first to introduce the idea that mater is not divided infinitly, but ther is a minimoun amout tha cant be splited, the atom (wich in Greek meens undevidable)
Democritus from Abdera