Thompson`s “Plum Pudding” Model
... number n. Electrons can jump from one orbit to another by emitting or absorbing energy. • The inset shows an electron jumping from orbit n=3 to orbit n=2, emitting a photon of red light with an energy of 1.89 eV. ...
... number n. Electrons can jump from one orbit to another by emitting or absorbing energy. • The inset shows an electron jumping from orbit n=3 to orbit n=2, emitting a photon of red light with an energy of 1.89 eV. ...
Chapter 7: Quantum Mechanical Model of Atom
... ground state (lowest energy level) into higher energy levels (excited states). – Electrons prefer ground state (more stable). ...
... ground state (lowest energy level) into higher energy levels (excited states). – Electrons prefer ground state (more stable). ...
Atomic Structure Teaching Resources
... 2.01 Analyze the historical development of the current atomic theory. – Early contributions: Democritus and Dalton. – The discovery of the electron: Thomson and Millikan. – The discovery of the nucleus, proton and neutron: Rutherford and Chadwick. – The Bohr model. – The quantum mechanical model. 2. ...
... 2.01 Analyze the historical development of the current atomic theory. – Early contributions: Democritus and Dalton. – The discovery of the electron: Thomson and Millikan. – The discovery of the nucleus, proton and neutron: Rutherford and Chadwick. – The Bohr model. – The quantum mechanical model. 2. ...
Ch:2
... nucleus. Must be equivalent to the number of electrons around the atom’s nucleus. Mass Number (A): The sum of the number of protons and the number of neutrons in an atom’s nucleus. Isotope: Atoms with identical atomic numbers but different mass numbers (due to differing number of neutrons). ...
... nucleus. Must be equivalent to the number of electrons around the atom’s nucleus. Mass Number (A): The sum of the number of protons and the number of neutrons in an atom’s nucleus. Isotope: Atoms with identical atomic numbers but different mass numbers (due to differing number of neutrons). ...
Practice problems for chapter 1, 2 and 3 1) A small amount of salt
... 1) A small amount of salt dissolved in water is an example of a __________. 2) Which one of the following is a pure substance? A) concrete B) wood C) salt water D) elemental copper E) milk 3) For which of the following can the composition vary? A) pure substance B) element C) both homogeneous and he ...
... 1) A small amount of salt dissolved in water is an example of a __________. 2) Which one of the following is a pure substance? A) concrete B) wood C) salt water D) elemental copper E) milk 3) For which of the following can the composition vary? A) pure substance B) element C) both homogeneous and he ...
Atomic Theory Note Packet
... 5. Atomic mass is the weighted average of the isotopes of a particular element. For example ~99% of carbon is Carbon-12 and ~1% is Carbon-14. In any sample of carbon on earth you will generally find this ratio. When you use a sample of carbon it contains both isotopes, so you need a way of determini ...
... 5. Atomic mass is the weighted average of the isotopes of a particular element. For example ~99% of carbon is Carbon-12 and ~1% is Carbon-14. In any sample of carbon on earth you will generally find this ratio. When you use a sample of carbon it contains both isotopes, so you need a way of determini ...
Atomic Theory Class #5
... higher orbits, then back down (emitting spectra as that happens) 6 The Wave-Mechanical, or Modern model. Electrons no longer orbit the nucleus, rather they hang out in zones or ORBITALS, where you have a statistical chance of finding them most of the time (or not so much). Electrons act as bits of n ...
... higher orbits, then back down (emitting spectra as that happens) 6 The Wave-Mechanical, or Modern model. Electrons no longer orbit the nucleus, rather they hang out in zones or ORBITALS, where you have a statistical chance of finding them most of the time (or not so much). Electrons act as bits of n ...
History of the Atom
... between two charged plates. > Calculated how strong an applied electric field has to be to stop the drop from falling due to gravity. ...
... between two charged plates. > Calculated how strong an applied electric field has to be to stop the drop from falling due to gravity. ...
Atoms, Molecules, and Ions The Evolution of the Atomic Model (from
... became known as Dalton’s Atomic Theory and he proposed this the year 1803. The primary difference between Dalton’s theory and previous ones was that Dalton’s was based on reproducible laboratory evidence. ...
... became known as Dalton’s Atomic Theory and he proposed this the year 1803. The primary difference between Dalton’s theory and previous ones was that Dalton’s was based on reproducible laboratory evidence. ...
Chapter 7
... 1. Aufbau Principle - electrons fill orbitals starting at the lowest available (possible) energy states before filling higher states 2. Pauli Exclusion Principle - two electrons cannot share the same set of quantum numbers within the same system. Therefore, there is room for only two electrons in ea ...
... 1. Aufbau Principle - electrons fill orbitals starting at the lowest available (possible) energy states before filling higher states 2. Pauli Exclusion Principle - two electrons cannot share the same set of quantum numbers within the same system. Therefore, there is room for only two electrons in ea ...
Chemistry 432: Final Exam Review Sheet
... c) alpha particle (24 or 24He ): a helium nucleus that has a charge of +2; common in very heavy nuclei. d) beta particle (-10 or -10e): an electron emitted from the nucleus and formed from the breakdown of one neutron into a proton and an electron. n p + -10 e) positron, anti-electron, (+10 or ...
... c) alpha particle (24 or 24He ): a helium nucleus that has a charge of +2; common in very heavy nuclei. d) beta particle (-10 or -10e): an electron emitted from the nucleus and formed from the breakdown of one neutron into a proton and an electron. n p + -10 e) positron, anti-electron, (+10 or ...
Chemical Element
... time it was not known which chemicals were elements and which compounds. When it was learned, existing names (e.g., gold, mercury, iron) were kept in most countries, and national differences emerged over the names of elements either for convenience, linguistic niceties, or nationalism. For example, ...
... time it was not known which chemicals were elements and which compounds. When it was learned, existing names (e.g., gold, mercury, iron) were kept in most countries, and national differences emerged over the names of elements either for convenience, linguistic niceties, or nationalism. For example, ...
Writing Electron Configurations - highamc
... • Helium is He 1s2 symbolizing there are 2 electrons in the s sublevel. • Lithium is 1s22s1 symbolizing that there are 2 electrons in the 1 s sublevel and 1 electron in the 2 s level. • Fluorine is written as 1s22s22p5 • Why do you think that there are only 2 electrons in the s sublevel, but there ...
... • Helium is He 1s2 symbolizing there are 2 electrons in the s sublevel. • Lithium is 1s22s1 symbolizing that there are 2 electrons in the 1 s sublevel and 1 electron in the 2 s level. • Fluorine is written as 1s22s22p5 • Why do you think that there are only 2 electrons in the s sublevel, but there ...
AP Chemistry Chapter 2 - Anderson School District One
... Which two of the following elements would you expect to show the greatest similarity in chemical and physical properties: B, Ca, F, He, Mg, P? ...
... Which two of the following elements would you expect to show the greatest similarity in chemical and physical properties: B, Ca, F, He, Mg, P? ...
Historical Development of an Atom - pams
... beam emitted (+) alpha particles toward gold foil. Most particles went through, some were deflected, and others bounced back! This showed that atoms have a very dense (+) center. ...
... beam emitted (+) alpha particles toward gold foil. Most particles went through, some were deflected, and others bounced back! This showed that atoms have a very dense (+) center. ...
Ch 5.1 The Nature of Chemical Reactions
... • Describe difference between endothermic and exothermic reactions ...
... • Describe difference between endothermic and exothermic reactions ...
Ch 23 Transition Metal Chemistry Notes- PART -1
... To understand the electron configurations of the ions shown in the above table, it helps to recall that electrons are removed from the outermost 4s orbital before they are taken out of the 3d. ...
... To understand the electron configurations of the ions shown in the above table, it helps to recall that electrons are removed from the outermost 4s orbital before they are taken out of the 3d. ...
Document
... 1) Most of the alpha particles went straight through. Most of the atom is empty space. 2) Some of the alpha particles were deflected back. The nucleus was tiny, but contained most of the mass of the atom. ...
... 1) Most of the alpha particles went straight through. Most of the atom is empty space. 2) Some of the alpha particles were deflected back. The nucleus was tiny, but contained most of the mass of the atom. ...
Study Guide - Chapter 11
... Section 1 – Development of the Atomic Theory Democritus – if you cut something, you eventually end up with a particle that can’t be cut A. Atom comes from the Greek word “Atomos”, meaning “not able to be divided” Atom – the smallest particle into which an element can be divided and still be the same ...
... Section 1 – Development of the Atomic Theory Democritus – if you cut something, you eventually end up with a particle that can’t be cut A. Atom comes from the Greek word “Atomos”, meaning “not able to be divided” Atom – the smallest particle into which an element can be divided and still be the same ...
Chapter 4 Atomic Structure
... compound, the masses of one element combined with a fixed mass of the second are in the ratio of small whole numbers. Same elements to combine in different ratios to give different substances. ...
... compound, the masses of one element combined with a fixed mass of the second are in the ratio of small whole numbers. Same elements to combine in different ratios to give different substances. ...
Honors Chemistry
... in the nucleus, also indicates the # of electrons charged of the atom, mass is slightly more than 1 amu ...
... in the nucleus, also indicates the # of electrons charged of the atom, mass is slightly more than 1 amu ...
Lecture 2-Extraction of Elements
... To choose most economical reducing agent and reaction condition Criterion for spontaneity ∆Go = − RT ln K ...
... To choose most economical reducing agent and reaction condition Criterion for spontaneity ∆Go = − RT ln K ...
only that they did. democritus, an early greek philosopher, even had
... Being asked what animal you'd like to be is a trick question; you're already an animal. Doug Coupland ...
... Being asked what animal you'd like to be is a trick question; you're already an animal. Doug Coupland ...
