Atomic Theory and Structure
... If it’s so small, how was it discovered? • Not long after Greece finally defeated Persia, a Greek philosopher named Democritus did some thinking – If you cut something in half, and then cut that in half, and keep going, you’ll end up with something you can’t cut ...
... If it’s so small, how was it discovered? • Not long after Greece finally defeated Persia, a Greek philosopher named Democritus did some thinking – If you cut something in half, and then cut that in half, and keep going, you’ll end up with something you can’t cut ...
•What makes up an atom? Draw an atom
... • Element - Pure substance that can’t be broken into other types of matter • Each element has its own symbol and specific number of protons ...
... • Element - Pure substance that can’t be broken into other types of matter • Each element has its own symbol and specific number of protons ...
A. Highlights for Section 1 pages 83
... developments of a model of an atom o 2400 years ago scientists did not have technology for direct evidence o Scientists used indirect evidence about an object without seeing or touching the object Describe the changes of the Atomic Model o Greek Model (Democritus) Smallest – atom - cannot be sub ...
... developments of a model of an atom o 2400 years ago scientists did not have technology for direct evidence o Scientists used indirect evidence about an object without seeing or touching the object Describe the changes of the Atomic Model o Greek Model (Democritus) Smallest – atom - cannot be sub ...
Early Atomic Theories and the Origins of Quantum Theory
... Democritus Democritus was the first to suggest that matter was composed of tiny particles known as “atomos” - Greek for atom ...
... Democritus Democritus was the first to suggest that matter was composed of tiny particles known as “atomos” - Greek for atom ...
Chapter 4: Introduction to Earth Chemistry Section 1 Notes
... A coefficient ___________________ the subscripts in an equation. Chemical Bonds The forces that hold together the atoms in molecules are called _______________________. Chemical bonds form because of ____________________________________________________________. Atoms form chemical bonds by either __ ...
... A coefficient ___________________ the subscripts in an equation. Chemical Bonds The forces that hold together the atoms in molecules are called _______________________. Chemical bonds form because of ____________________________________________________________. Atoms form chemical bonds by either __ ...
Mileposts on the road to the atom
... Matter is made of the four elements (earth, wind and fire...and water) ...
... Matter is made of the four elements (earth, wind and fire...and water) ...
Atoms The smallest piece of matter that have specific properties of
... Found in the atomic nucleus. Neutron (no charge neutrons) No charge (neutral) Found in the nucleus. Electron (negative electrons) Negatively charged particles Found in the outer shells. Electrons determine properties of the atom. Chemical reactions involve sharing or exchanging electrons. ...
... Found in the atomic nucleus. Neutron (no charge neutrons) No charge (neutral) Found in the nucleus. Electron (negative electrons) Negatively charged particles Found in the outer shells. Electrons determine properties of the atom. Chemical reactions involve sharing or exchanging electrons. ...
Models of the Atom
... matter are combinations of these basic elements • Based on philosophy, not experiment • Model accepted for 2000 years. ...
... matter are combinations of these basic elements • Based on philosophy, not experiment • Model accepted for 2000 years. ...
Atomic Theory
... Elements are made of tiny particles called atoms. All atoms of a given element are identical. The atoms of an element are different from those of any other element. Atoms of one element combine with others to form compounds. Atoms are indivisible in chemical processes. A chemical reaction changes th ...
... Elements are made of tiny particles called atoms. All atoms of a given element are identical. The atoms of an element are different from those of any other element. Atoms of one element combine with others to form compounds. Atoms are indivisible in chemical processes. A chemical reaction changes th ...
What are the parts of an atom?
... •Scientists now know that atoms are made of even smaller particles, but the atom is the smallest unit that has the ______________________________properties of an element. ...
... •Scientists now know that atoms are made of even smaller particles, but the atom is the smallest unit that has the ______________________________properties of an element. ...
DEFINING THE ATOM
... Responsible for completing the information for their atomic theory on the Atomic theory worksheet. Responsible for drawing a model of their atom from their atomic theory. ...
... Responsible for completing the information for their atomic theory on the Atomic theory worksheet. Responsible for drawing a model of their atom from their atomic theory. ...
theory
... 1909 and with Thomson's results also a value for the electron mass was obtained. First successful scientific attempt to detect and measure the effect of an individual subatomic particle. For this and his work on the photoelectric effect Robert Millikan won the 1923 Nobel Prize in physics. ...
... 1909 and with Thomson's results also a value for the electron mass was obtained. First successful scientific attempt to detect and measure the effect of an individual subatomic particle. For this and his work on the photoelectric effect Robert Millikan won the 1923 Nobel Prize in physics. ...
File
... into smaller and smaller particles – these are atoms. If you could line up 100,000,000 copper atoms in a single file, they would be approximately 1 cm long ...
... into smaller and smaller particles – these are atoms. If you could line up 100,000,000 copper atoms in a single file, they would be approximately 1 cm long ...
Atoms: The Building Blocks of Matter
... 4. Atoms of different elements combine in simple whole-# ratios to form chemical compounds 5. In chemical reactions, atoms are combined, separated, or rearranged but not destroyed ...
... 4. Atoms of different elements combine in simple whole-# ratios to form chemical compounds 5. In chemical reactions, atoms are combined, separated, or rearranged but not destroyed ...
Goal 5 – Structure and Properties of Matter
... Ernest Rutherford – conducted experiments to conclude that atoms have a dense positive centre, called a nucleus, and a less dense area outside the nucleus, in which the electrons orbited much the same way that planets orbit the sun. Niels Bohr – stated that electrons orbit the nucleus according to s ...
... Ernest Rutherford – conducted experiments to conclude that atoms have a dense positive centre, called a nucleus, and a less dense area outside the nucleus, in which the electrons orbited much the same way that planets orbit the sun. Niels Bohr – stated that electrons orbit the nucleus according to s ...
02 Chemistry Fundamentals
... What we experience around us results from the interactions of atoms Atoms combine together to make? Molecules. ...
... What we experience around us results from the interactions of atoms Atoms combine together to make? Molecules. ...
The Development of Atomic Theory
... The atoms in Democritus’ theory themselves remain unchanged, but move about in space to combine in various ways to form all macroscopic objects. Early atomic theory stated that the characteristics of an object are determined by the shape of its atoms. So, for example, sweet things are made of smooth ...
... The atoms in Democritus’ theory themselves remain unchanged, but move about in space to combine in various ways to form all macroscopic objects. Early atomic theory stated that the characteristics of an object are determined by the shape of its atoms. So, for example, sweet things are made of smooth ...
Chapter 18 Notes
... • An atom can have 2 or more isotopes • Isotopes have different numbers of neutrons – Thus different mass numbers – More N add mass to atom – Heavier elements are radioactive (give off N) ...
... • An atom can have 2 or more isotopes • Isotopes have different numbers of neutrons – Thus different mass numbers – More N add mass to atom – Heavier elements are radioactive (give off N) ...
Atomic Theories and Scientists Notes
... Law of Multiple Proportions • Who: John Dalton • Two elements form more than one compound between them • The ratios of the masses of the second element which combine with a fixed mass of the first element will be small whole numbers. • Where: England ...
... Law of Multiple Proportions • Who: John Dalton • Two elements form more than one compound between them • The ratios of the masses of the second element which combine with a fixed mass of the first element will be small whole numbers. • Where: England ...
2-1 Checkpoint - Jordan High School
... • Electrons occupy shells around nucleus – Unfilled shells make atom unstable ...
... • Electrons occupy shells around nucleus – Unfilled shells make atom unstable ...
Biology Fall Semester Test 1 Study Guide
... The closing of its shell when a clam is removed from its watery environment is an example of how a clam maintains its: In a trophic pyramid, _______% of the energy from a source is passed on to the next level All living things are ________________, meaning they can’t survive on their own. The study ...
... The closing of its shell when a clam is removed from its watery environment is an example of how a clam maintains its: In a trophic pyramid, _______% of the energy from a source is passed on to the next level All living things are ________________, meaning they can’t survive on their own. The study ...
History of molecular theory
In chemistry, the history of molecular theory traces the origins of the concept or idea of the existence of strong chemical bonds between two or more atoms.The modern concept of molecules can be traced back towards pre-scientific Greek philosophers such as Leucippus who argued that all the universe is composed of atoms and voids. Circa 450 BC Empedocles imagined fundamental elements (fire (20px), earth (20px), air (20px), and water (20px)) and ""forces"" of attraction and repulsion allowing the elements to interact. Prior to this, Heraclitus had claimed that fire or change was fundamental to our existence, created through the combination of opposite properties. In the Timaeus, Plato, following Pythagoras, considered mathematical entities such as number, point, line and triangle as the fundamental building blocks or elements of this ephemeral world, and considered the four elements of fire, air, water and earth as states of substances through which the true mathematical principles or elements would pass. A fifth element, the incorruptible quintessence aether, was considered to be the fundamental building block of the heavenly bodies. The viewpoint of Leucippus and Empedocles, along with the aether, was accepted by Aristotle and passed to medieval and renaissance Europe. A modern conceptualization of molecules began to develop in the 19th century along with experimental evidence for pure chemical elements and how individual atoms of different chemical substances such as hydrogen and oxygen can combine to form chemically stable molecules such as water molecules.