applied to all types of matter. The theory states that atoms have no specific size and can vary, but they cannot be divided, regardless of their size. Democritus did not invent the theory. His teacher, Leucippus, taught him some of the basic information about the particles of life. Leucippus believed that atoms were “infinite in number and imperceptible because of the minuteness of their size. “ Democritus’ teacher also believed that the atoms moved within empty space, and they grouped together
Theory of the Atom Tayyab Hussain Niels Bohr Niels Bohr was a Danish physicist And was quite successful. He was mainly interested in Quantum physics and Quantum mechanics and these are what were the basis of his ideas. He said that the nucleus is “Orbited” by electrons in energy levels and when an electron is excited or has energy transferred to it it will move up an energy level and on the way back will release a photon- a electromagnetic packet of energy. When this happens you can often
is made up of atom. Chemistry is the study of matter its composition and the changes that occur. Anything that takes up space is called the matter. The property of matter is that it has mass, it has inertia. Matter is composed of elements, compounds and mixture .The basic unit of all matter is atom .Many atoms forms an element, many element forms a compound. Atoms are the smallest particle of an element that has the properties of the element. There are many examples of an atom .Carbon, hydrogen
The Atom By: Jessica Kettlewell History: Democritus began the search for a description of matter more than 2400 years ago. His theory stated: Matter could not be divided into smaller and smaller pieces forever, eventually the smallest possible piece would be obtained. This piece would be indivisible. He named the smallest piece of matter “atomos,” meaning “not to be cut.” To Democritus, atoms were small, hard particles that were all made of the same material but were different shapes and sizes
Thomson - discovery of electrons Rutherford - discovery of nucleus Chadwick - discovery of neutron Bohr - planetary model of atom ket09232004 Atomic History: An Overview • • • • • • Early Greeks - Democritus vs. Aristotle Dalton’s Atomic Theory Thomson - discovery of electrons Rutherford - discovery of nucleus Chadwick - discovery of neutron Bohr - planetary model of atom Early Greeks • What is the nature of matter? -Infinitely divisible pieces of “stuff” -Earth, Air, Fire ,and Water
The study of heat relate to Kinetic theory of matter is that universe is made up of matter and energy. Matter is made up of atoms and molecules. Atoms and molecules are always in motion because energy. Energy forces them to contact into each other or vibrate back and forth. When this happens molecules and atoms creates a form of energy called (heat ) thermal energy which is present in all matter. (“Matter”2009) Molecules interact , attracting each other
Physics Essay Atoms: Protons Neutrons Electrons Atoms: Protons, Neutrons and Electrons Atoms are the building blocks of matter. Atoms are used in our everyday lives and without them there are many things that we would have possessions of. Atoms make up everything around us, including the air we breathe, the food we eat and even the stars in the beautiful sky. The word atom may seem very common to many but the history of the atom is one that is not very common to mankind. The atom is a word we learn
substances are made up of atoms, molecules and compounds and, matter is a general name given to ALL substances encountered in our everyday lives, and all substances are made up of Atoms, then it follows that matter is composed of Atoms #2-our eyes are limited in terms of focal strength and magnification for visualizing objects. #3-Law of definition proportions: a chemical compound always contains exactly the same proportion of elements by mass. There is one type of atom for each element; compounds
How Small are Atoms? This experiment can be performed with only a pair of scissors and a strip of paper. Cut a sheet of colored paper into 11-inch long strips, providing one strip for each student doing the project. Give each student a pair of scissors. Instruct students to cut the paper strip in half, then cut those halves into halves. Have them keep cutting the strip pieces into halves as many times as possible. (Make sure they always cut in the same direction; when the strips become much wider
The atom is built three basic types of subatomic particles. Protons: These have a positive charge and sit in the centre of the atom called the nucleus. Neutrons: These have no charge and sit in the nucleus with the protons. Electrons: These have a negative charge. They spin around the nucleus at very high speeds. Opposite charges attract each other, and this keeps the atom together. Atomic Mass and Number The number of protons = The number of electrons The number of protons in an atom is