Who discovered the atom?

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In the 5th cent. B.C. the Greek philosophers Democritus and Leucippus proposed that matter was made up of tiny, indivisible particles they called atom, or in Greek "a-tomos". The reason why they assumed this is because nothing can come from nothing. Around 1803, John Dalton (1766-1844) developed the first useful atomic theory of matter. He imagined the atom as a sphere full of an electrically positive substance mixed with negative electron. Then in 1897, Thompson discovered the first component part of the atom: the electron, a particle with a negative electric charge. Discovery of the Atom
By the 19th century, technology had advanced greatly and many elements had been discovered to work with. Using the available elements scientist such as John Dalton and Amedeo Avogadro forced them to interact with one another. From these interactions they were able to prove the existence of the atom.  
That depends on exactly what you mean by "discovered."

Jainism had a concept of small particles similar to atoms in the 6th millennium BC, and either Democritus or his mentor Leucippus (or possibly both together) independently came up with the idea (and the word "atomos", which is Greek for "uncuttable") in the 5th century BC. However, these were essentially lucky guesses; there was no real scientific basis behind them, so saying these people "discovered" atoms is a pretty big stretch.

The best candidate is probably John Dalton, who in the early 19th century proposed (based this time on experiments) that substances were composed of tiny discrete particles, and even assigned relative weight values to several types of these particles. The word Democritus had used was "Englishified" slightly to come up with the modern word "atom" to refer to these particles.  

John Dalton was the first who introduced the idea of atom. Atom, the very word, means inseparable or indivisible. Based on that idea in chemistry many laws have been stated such as, law of coservation of mass, law of multiple proportions etc etc.
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When was the atom discovered?

That's a complicated question, with an answerthat needs both philosophy and science. There was no singleexperiment which suddenly showed the existence of atoms. The storystart

When were atoms discovered?

The concept of atoms, or particles that make up all of matter, isan ancient one. However, John Dalton came up with the firstscientific atomic theory in the early 1800s.

Who discovered the atoms?

John Dalton was probably the first to say that matter was made up of atoms with some kind of scientific basis for the statement. He even gave reasonably correct relative weigh

How did the atom get discovered?

People found a way to look really close at stuff and poof! There it was. The question is...did it really exist before we discovered it?

Who Discovered the atom bomb?

Leo Szilard filed a patent on it in 1939. The U.S. Manhattan project built the first ones in 1945.

Who discovered atoms where and when?

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.

When were atoms discoved?

Atoms were theorised to exist in Ancient Greece but were proven toexist by Einstien when he explained Brownian motion.

How were atom discovered?

The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny quantities has been around for millennia, but these ideas were founded in abs

Who discovered the atom silver?

\nthe person that created the element silver was gullable strofitz. He found this discovery in the early 1900's, and it became very well known by the ninetinth century
In Atoms and Atomic Structure

What if you didn't get the German scientist who discovered the atom bomb?

No German scientist discovered the Atomic Bomb, so this question is meaningless. A Hungarian scientist, Leo Szilard, invented the Atomic Bomb in 1933 and he was already
In Atoms and Atomic Structure

When was atom is discovered?

The atom was discorvered by john dalton in the early 1800's