1. The Begenius School of Atom Model Drawing Everything you wanted to know to pass your next quiz on atoms

2. People, Theories, and Models Democritus – ancient Greek that named the atom after “atomos” which means indivisible. Democritus – ancient Greek that named the atom after “atomos” which means indivisible. Aristotle argued against this idea suggesting that matter could be divided infinitely. Aristotle argued against this idea suggesting that matter could be divided infinitely. John Dalton – first chemist that made the first table of elements and was the first to suggest that atoms of gold were unique and different from atoms of iron. He had a theory called the billiard ball model of atoms…suggesting that atoms were like balls that collide with each other and have unique masses and properties. John Dalton – first chemist that made the first table of elements and was the first to suggest that atoms of gold were unique and different from atoms of iron. He had a theory called the billiard ball model of atoms…suggesting that atoms were like balls that collide with each other and have unique masses and properties. Dalton proved in 1802 that atoms were real and he pictured them as small billiard balls. He used an example that if you had some gold each atom would be solid gold. Dalton proved in 1802 that atoms were real and he pictured them as small billiard balls. He used an example that if you had some gold each atom would be solid gold.

3. More about People, Theories, and Models In1897 J.J. Thomson published a theory called the Plum Pudding Model of an atom. In1897 J.J. Thomson published a theory called the Plum Pudding Model of an atom. His model put the first electrical quantities into the model called electrons. His model put the first electrical quantities into the model called electrons. The electrons were seen as negative charges and the pudding part of the model was seen as a positively charged material making up the rest of the atom. The electrons were seen as negative charges and the pudding part of the model was seen as a positively charged material making up the rest of the atom. Plum Pudding Model

4. Even more about people, theories and models In 1911 Ernest Rutherford disproved the plum pudding model by proving the existence of a nucleus which held most of the mass and an empty space between the nucleus and the orbits of electrons. In 1911 Ernest Rutherford disproved the plum pudding model by proving the existence of a nucleus which held most of the mass and an empty space between the nucleus and the orbits of electrons. Eventually this grew into our model that has protons and neutrons in the nucleus and electrons in orbits spinning around the nucleus. Eventually this grew into our model that has protons and neutrons in the nucleus and electrons in orbits spinning around the nucleus.

5. Final notes about people, theories and models Niels Bohr applied quantum physics to the model of the atom in 1913 and added a specific orbital/energy level concept to the atom. Niels Bohr applied quantum physics to the model of the atom in 1913 and added a specific orbital/energy level concept to the atom. Each atom is now seen as having a specific pattern of space where electrons can be found called s, p, d, and f orbitals. Each atom is now seen as having a specific pattern of space where electrons can be found called s, p, d, and f orbitals.

6. Final notes about people, theories and models The electron cloud model puts all of the parts of the atom into high speed motion, and suggest that we never really know exactly where electrons will be but that there are regions where we may find them. The electron cloud model puts all of the parts of the atom into high speed motion, and suggest that we never really know exactly where electrons will be but that there are regions where we may find them. Erwin Schrodinger is credited with the cloud model. Erwin Schrodinger is credited with the cloud model. The cloud model represents a sort of history of where the electron has probably been and where it is likely to be going. The red dot in the middle represents the nucleus while the red dot around the outside represents an instance of the electron. Imagine, as the electron moves it leaves a trace of where it was. This collection of traces quickly begins to resemble a cloud. The cloud model represents a sort of history of where the electron has probably been and where it is likely to be going. The red dot in the middle represents the nucleus while the red dot around the outside represents an instance of the electron. Imagine, as the electron moves it leaves a trace of where it was. This collection of traces quickly begins to resemble a cloud.

7. How to Draw an Atom First step is to find the element on the periodic table. First step is to find the element on the periodic table. Which row or period is it in? This tell you how many orbitals it has. Which row or period is it in? This tell you how many orbitals it has. What is its atomic number? This tells you the number of protons and electrons it has. What is its atomic number? This tells you the number of protons and electrons it has. What is the atomic mass (weight)? Round it off and subtract the atomic number and you have found the number of neutrons. What is the atomic mass (weight)? Round it off and subtract the atomic number and you have found the number of neutrons. Record these answers in a table Record these answers in a table like this Check out an example. OPEN

8. 2556OPEN + + + + + o o o o o o - - - - - ? ? ? ? ?-hold places in orbitals that could have an electron but do not have one ?

9. Try to draw carbon, and oxygen and see how you do. Ask Mr. Manning when you return to class on Wednesday for help if you do not understand. Ask Mr. Manning when you return to class on Wednesday for help if you do not understand. Try the review slides that follow. Try the review slides that follow.

10. Review This ancient Greek named the atom. This ancient Greek named the atom.Democritus This Greek argued against the existence of atoms. This Greek argued against the existence of atoms.Aristotle He was the first chemist and made the first table of elements He was the first chemist and made the first table of elements John Dalton In 1897 he published the Plum Pudding Model which put the electron into the atom. In 1897 he published the Plum Pudding Model which put the electron into the atom. J.J. Thomson He put the nucleus into the atom model He put the nucleus into the atom model Ernest Rutherford He put the specific regions of electrons called orbitals into the model. He put the specific regions of electrons called orbitals into the model. Niels Bohr He helped develop the electron Cloud model. He helped develop the electron Cloud model. Erwin Schrodinger

11. Review Continued The particle with a positive charge in the nucleus of the atom The particle with a positive charge in the nucleus of the atomProton The particle in the nucleus of the atom with no charge The particle in the nucleus of the atom with no chargeNeutron The particle with a negative charge that spins at high speed around the nucleus of the atom The particle with a negative charge that spins at high speed around the nucleus of the atomElectron Particles numbers that are the same as the atomic number Particles numbers that are the same as the atomic number Protons and electrons Particle number the same as the atomic mass or weight Particle number the same as the atomic mass or weightNone Particle number found by subtracting the atomic number from the atomic mass whole number part Particle number found by subtracting the atomic number from the atomic mass whole number partNeutron The atomic structure number found by the row or period on which an element is found The atomic structure number found by the row or period on which an element is found Number of orbitals The symbol used to represent spaces in an atom where electrons could be found but are not found The symbol used to represent spaces in an atom where electrons could be found but are not found Question mark