The Nuclear Theory Of The Atomic Theory

John Dalton wrote the modern atomic theory, a fundamental component of that is, the mole ratios of elements in a compound will be small whole numbers.

In this experiment, you will have a chance to test the hypothesis that Ernest Rutherford used when determining the size of the nucleus. In his "gold foil experiment," Rutherford shot alpha particles at gold atoms. Once he realized that the alpha particles were hitting a concentrated positive mass, he developed the nuclear model of the atom. Next, he set out to determine the relative size of the nucleus compared to the rest of the atom. He reasoned that the smaller the nucleus, the less likely it was to be hit by an alpha particle. This led to a simple comparative ratio:

Democritus of Abdera was a greek philosopher born around 460 BC, a cheerful and blissful man. He was one of the two founding fathers of the Atomic Theory. His thought process on the theory, was that matter was comprised of tiny building particles called atoms. This theory was widely questionable at this time. As people were not very well accustomed with accepting new ideas, and/or new concepts of philosophy and science. This theory was only partially correct, and as scientist of the more modern age began to look deeper into Democritus’s work, they begin to make new theories and hypothesize new ideas about the atom. Which later on, would lead to the development of the atomic theory and the most accurate description of the atom with the work of Niels Bohr.

We all live in a complex universe and human is curious about by nature. What is the world made of? This is an enormous progress era that allows humans to find some answers to their curiosity. And string theory is the recent attempt of humans to answer this curiosity. Our basic science would explain to us that the world is made of matter. This ordinary matter is made of atoms which is composed of the basic components, electrons which are around the nucleus,a nucleus that is composed of neutrons and protons and both contain smaller particles known as quarks.

Atoms of the same element can have different masses, this is called isotopes. After 200 years John Dalton discovery of the Dalton’s Atomic theory it is still used today John Dalton’s atomic theory is the foundation of which Chemistry was built on.

the old view of atoms as the basic building blocks of the material world and Newtonian physics

  The understanding of the structure of atoms has changed throughout history. The first documented case of the discovery of atoms dates back to 450 B.C with two Greek philosophers, Leucippus and Democritus (Doc. 1). This was only a theory; however, they proposed the idea that all matter is made up of atoms.

Around 2,500 years ago, Democritus and his partner Leucippus were the first ones to develop the atomic theory in written history. Their theory proposed that every kind of matter was made up of tiny particles, which were named atomos, which means that it is indivisible. This meant that Democritus and Leucippus thought there were little particles of everything, but, the next breakthrough in atomic theory wasn’t made until the early 1800s with a french chemist by the name of Antoine Lavoisier, he was the one who came up with the idea of the law of the conservation of mass, which states that matter stays the same even when it changes shape or form. Then, James Dalton said that all matter was made up of atoms, which were indivisible, and unbreakable.

He stated that this was a mysterious force but never continued his research on it. Then in 460 B.C. there was a philosopher named Democritus. Democritus and his mentor Leocippus posed the question that if he broke bread into multiple pieces how many would breaks would it take until there was no more bread. He then was able to make a few theories being all matter was created of atoms and atoms are solid but not invisible. However, there was a man named Aristotle and many other philosophers who disagreed with Democritus and said matter was composed of four main elements. Earth, fire, air, and water. For example, a liquid was made of water and a stone was made of rock. Therefore, Democritus’s theory “ was rejected by Aristotle, one of the most influential philosophers of Ancient Greece; and the atomic theory was ignored for nearly 2,000 years.”(

Democritus made the atomic theory widely known, which stated that the universe is composed of two elements: the atoms and the void in which these atoms exist and move. (More, 1646)

Around 1803 John Dalton, an English chemist developed the first useful atomic theory of matter. Amedeo Avogadro, the Italian chemist in 1811 published an article drawing the distinction between the atom and the molecule, which now is known as “Avogadro’s

Ernest Rutherford was a New Zealand born British physicist who is famously known for “splitting the atom.” His work on the gold foil experiment contributed greatly to the model of the atom and helped develop the standard model of the atom to what we now use today. Without his contributions we would still be using the Plum Pudding model, an out dated and incorrect model, and we would have less of an understanding of how atoms form the world around us.

How atoms make up our very existence is an eye-opener when he explains it as, “…for you to be here now trillions of drifting atoms had somehow to assemble in an intricate and intriguingly obliging manner to create you”. In ‘The Mighty Atom’, Bryson elaborates on the structure of the atom; how protons, the positive particles of the atom uniquely identify every element. The proton’s negative counter parts are the fast moving electrons. After a quick scientific step into the atomic world, Bryson ends with a witty quote ‘Protons give an atom its identity, electrons its

First scientist to suggest that all matter is composed of small, indivisible particles called atoms

The Discovery of the Atom first came from the Greeks which made a theory “The idea that all matter is made up of tiny, indivisible particles, or atoms, is believed to have originated with the Greek philosopher Leucippus of Miletus and his student Democritus of Abdera in the 5th century B.C. (The word atom comes from the Greek word atomos, which means “indivisible.”)” (InfoPlease Atomic theory)