NOTES: ATOMIC THEORY
... experimenting with cathode rays [a glowing beam which travels from the cathode (-) to the anode (+)]; his experiment is know as the cathode –ray tube experiment. He found that the e- was almost 2000 times lighter than a hydrogen atom, which was thought to be the lightest component of matter. (1911, ...
... experimenting with cathode rays [a glowing beam which travels from the cathode (-) to the anode (+)]; his experiment is know as the cathode –ray tube experiment. He found that the e- was almost 2000 times lighter than a hydrogen atom, which was thought to be the lightest component of matter. (1911, ...
Review
... Atoms are electrically neutral because they contain equal numbers of ______________________ and _____________________________. The neutron is electrically_______________________ ...
... Atoms are electrically neutral because they contain equal numbers of ______________________ and _____________________________. The neutron is electrically_______________________ ...
Ch 17 Properties of Atoms - Effingham County Schools
... properties is the periodic table. Each small square on the periodic table shows the name of one element and the letter symbol for that element. The elements are arranged based on the number of protons an atom of that element has in its nucleus. Periodic law states that when elements are arrang ...
... properties is the periodic table. Each small square on the periodic table shows the name of one element and the letter symbol for that element. The elements are arranged based on the number of protons an atom of that element has in its nucleus. Periodic law states that when elements are arrang ...
Chapter 4, Lesson 2: The Periodic Table
... Each student should find and present some basic information about their element to the class. The presentation can be in the form of a poster, pamphlet, PowerPoint presentation or other form. The presentations should be short and can include: atom name, atomic number, derivation of name, when and wh ...
... Each student should find and present some basic information about their element to the class. The presentation can be in the form of a poster, pamphlet, PowerPoint presentation or other form. The presentations should be short and can include: atom name, atomic number, derivation of name, when and wh ...
Review for Test
... 7. Lead has an atomic number of 82. How many protons and electrons does lead have? _____________________________________________________________________________________________ 8. Oxygen has 8 electrons. How many protons does oxygen have?__________________ 9. Zinc has 30 protons. What is its atomic ...
... 7. Lead has an atomic number of 82. How many protons and electrons does lead have? _____________________________________________________________________________________________ 8. Oxygen has 8 electrons. How many protons does oxygen have?__________________ 9. Zinc has 30 protons. What is its atomic ...
Name: ___________ Class: _____ Date: _______________ FALL
... c. sugar is dissolved in a solution. d. an unexpected color change occurs. ____ 11. Which sign does NOT indicate that a chemical change has occurred? a. color change. c. energy absorbed or released. b. dissolving in a solution. d. gas produced. ____ 12. A physical change occurs when a. milk sours. c ...
... c. sugar is dissolved in a solution. d. an unexpected color change occurs. ____ 11. Which sign does NOT indicate that a chemical change has occurred? a. color change. c. energy absorbed or released. b. dissolving in a solution. d. gas produced. ____ 12. A physical change occurs when a. milk sours. c ...
atoms - schultz915
... Democritus (400 B.C. ) – coins the term “atom” saying matter can be subdivided only as small as an elemental particle. from Greek “a” means not and “tomos” means cutting atom means “indivisible” ...
... Democritus (400 B.C. ) – coins the term “atom” saying matter can be subdivided only as small as an elemental particle. from Greek “a” means not and “tomos” means cutting atom means “indivisible” ...
Chapter 2 - Bruder Chemistry
... Atomic Weight & Decimals Atomic Weight- of an element is a weighted average mass of the atoms in a naturally occurring sample of an element Atomic Weights use decimal points because it is an average of an element ...
... Atomic Weight & Decimals Atomic Weight- of an element is a weighted average mass of the atoms in a naturally occurring sample of an element Atomic Weights use decimal points because it is an average of an element ...
Teaching/Chemistry/Chemistry Lesson Plans 04
... o Atomic Mass of an element is a weighted average mass of the atoms in a naturally occurring sample of the element o Weighted average mass reflects the mass and relative abundance of the isotopes as they naturally occur - Periodic Table Objective: Describe the origin of the periodic table; Identify ...
... o Atomic Mass of an element is a weighted average mass of the atoms in a naturally occurring sample of the element o Weighted average mass reflects the mass and relative abundance of the isotopes as they naturally occur - Periodic Table Objective: Describe the origin of the periodic table; Identify ...
Chapter 16 - Structure of an Atom - from class 4/13/15
... NOTICE -- the number of protons DOES NOT change if it is to be carbon -- only the number of neutrons. ...
... NOTICE -- the number of protons DOES NOT change if it is to be carbon -- only the number of neutrons. ...
Atomic
... To find the AVERAGE # of Neutrons in the atom • Round the atomic mass to a whole # • Subtract the # of protons (also the atomic #) • The difference is the average # of neutrons in the nucleus. ...
... To find the AVERAGE # of Neutrons in the atom • Round the atomic mass to a whole # • Subtract the # of protons (also the atomic #) • The difference is the average # of neutrons in the nucleus. ...
TEST on Atomic Structure
... _____ 55) How do the isotopes Carbon-12 and Carbon-13 differ? a. Carbon-12 has one more electron than hydrogen-1. b. Carbon-12 has 12 neutrons; carbon-13 has 13 neutrons c. Carbon-13 has one more neutron than carbon-12 d. Carbon-13 has one more proton that carbon-12 _____ 56) The atomic mass of an ...
... _____ 55) How do the isotopes Carbon-12 and Carbon-13 differ? a. Carbon-12 has one more electron than hydrogen-1. b. Carbon-12 has 12 neutrons; carbon-13 has 13 neutrons c. Carbon-13 has one more neutron than carbon-12 d. Carbon-13 has one more proton that carbon-12 _____ 56) The atomic mass of an ...
Topic exploration pack
... consider the nuclei as stable and indivisible. While learners, especially those who have also been learning chemistry, and indeed to a lesser extent biology, will already have encountered examples of atoms losing and gaining electrons, but, as far as most of the other topics in the course are concer ...
... consider the nuclei as stable and indivisible. While learners, especially those who have also been learning chemistry, and indeed to a lesser extent biology, will already have encountered examples of atoms losing and gaining electrons, but, as far as most of the other topics in the course are concer ...
Chapter 4, Lesson 2: The Periodic Table
... or neutron). The majority of the atomic mass is contributed by the protons and neutrons. For any element in the periodic table, the number of electrons in an atom of that element always equals the number of protons in the nucleus. But this is not true for neutrons. Atoms of the same element can have ...
... or neutron). The majority of the atomic mass is contributed by the protons and neutrons. For any element in the periodic table, the number of electrons in an atom of that element always equals the number of protons in the nucleus. But this is not true for neutrons. Atoms of the same element can have ...
chapter5 - MrFoti.com
... the symbol of the element, the mass number and the atomic number. Mass number Atomic number ...
... the symbol of the element, the mass number and the atomic number. Mass number Atomic number ...
Atomic Structure
... Protons, neutrons, and electrons can be calculated from atomic number and mass number. How many protons, electrons, and neutrons are in each atom? ...
... Protons, neutrons, and electrons can be calculated from atomic number and mass number. How many protons, electrons, and neutrons are in each atom? ...
The Structure of the Atom
... represented in the example? • Determine the number of: ▫ protons _____ ▫ electrons _____ ▫ neutrons _____ ...
... represented in the example? • Determine the number of: ▫ protons _____ ▫ electrons _____ ▫ neutrons _____ ...
File
... Cathode rays have identical properties regardless of the element used to produce them. All elements must contain identically charged electrons. Atoms are neutral, so there must be positive particles in the atom to balance the negative charge of the electrons Electrons have so little mass that a ...
... Cathode rays have identical properties regardless of the element used to produce them. All elements must contain identically charged electrons. Atoms are neutral, so there must be positive particles in the atom to balance the negative charge of the electrons Electrons have so little mass that a ...
Ordering the elements in the Periodic Table
... hold. Moseley turned down the opportunity to do a safe scientific job in Britain and became an officer in the Royal Engineers. He was killed by a sniper in Turkey in August 1915. Many people think that Britain lost a future Nobel Prize winner. This is because Nobel Prizes, the most prestigious award ...
... hold. Moseley turned down the opportunity to do a safe scientific job in Britain and became an officer in the Royal Engineers. He was killed by a sniper in Turkey in August 1915. Many people think that Britain lost a future Nobel Prize winner. This is because Nobel Prizes, the most prestigious award ...
Chapter 3—Time and Geology
... Precambrian Period (28): Pertaining to all of geologic time and its corresponding rocks before the beginning of the Paleozoic Era. Proterozoic Eon (28): Refers to the time interval from 2500 to 544 million years ago. proton (34): An elemental particle found in the nuclei of all atoms that has a posi ...
... Precambrian Period (28): Pertaining to all of geologic time and its corresponding rocks before the beginning of the Paleozoic Era. Proterozoic Eon (28): Refers to the time interval from 2500 to 544 million years ago. proton (34): An elemental particle found in the nuclei of all atoms that has a posi ...
Chapter 4 powerpoint
... What happens when an element emits radioactive particles? A. It gains energy. B. It gains neutrons. ...
... What happens when an element emits radioactive particles? A. It gains energy. B. It gains neutrons. ...
Chapter 4 Reviewing Content - Huber Heights City Schools
... numbers of protons, they also have identical numbers of electrons; electrons are the subatomic particles that are responsible for chemical behavior. (73)In the periodic table, what happens to the pattern of properties within a period when you move ...
... numbers of protons, they also have identical numbers of electrons; electrons are the subatomic particles that are responsible for chemical behavior. (73)In the periodic table, what happens to the pattern of properties within a period when you move ...
Atomic Structure Test – Study Guide
... What is the electrical charge and position in the atom for each of the subatomic particles? 1. Electron - negative charge; located in a “cloud” rotating around the nucleus 2. Proton – positive charge; located in the center or nucleus of the atom 3. Neutron - no charge; located in the center or nucle ...
... What is the electrical charge and position in the atom for each of the subatomic particles? 1. Electron - negative charge; located in a “cloud” rotating around the nucleus 2. Proton – positive charge; located in the center or nucleus of the atom 3. Neutron - no charge; located in the center or nucle ...
Lecture 2 - Unit 1 Part 2 Slides
... chemically combining two or more elements. It has different properties from its constituent elements. ...
... chemically combining two or more elements. It has different properties from its constituent elements. ...
Promethium
Promethium, originally prometheum, is a chemical element with symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements. Promethium shows only one stable oxidation state of +3; however, a few +2 compounds may exist.In 1902, Bohuslav Brauner suggested there was an element with properties intermediate between those of the known elements neodymium (60) and samarium (62); this was confirmed in 1914 by Henry Moseley who, having measured the atomic numbers of all the elements then known, found there was an element with atomic number 61. In 1926, an Italian and an American group claimed to have isolated a sample of element 61; both ""discoveries"" were soon proven to be false. In 1938, during a nuclear experiment conducted at Ohio State University, a few radioactive nuclides were produced that certainly were not radioisotopes of neodymium or samarium, but there was a lack of chemical proof that element 61 was produced, and the discovery was not generally recognized. Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor. The discoverers proposed the name ""prometheum"" (the spelling was subsequently changed), derived from Prometheus, the Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans, to symbolize ""both the daring and the possible misuse of mankind's intellect"". However, a sample of the metal was made only in 1963.There are two possible sources for natural promethium: rare decays of natural europium-151 (producing promethium-147), and uranium (various isotopes). Practical applications exist only for chemical compounds of promethium-147, which are used in luminous paint, atomic batteries, and thickness measurement devices, even though promethium-145 is the most stable promethium isotope. Because natural promethium is exceedingly scarce, it is typically synthesized by bombarding uranium-235 (enriched uranium) with thermal neutrons to produce promethium-147.