Chapter Review - BAschools.org
... 13. The modern periodic table is organized by a. size of atom b. atomic mass c. number of neutrons d. atomic number 14. Elements in a group have a. a wide range of chemical properties b. the same atomic radius c. similar chemical properties d. the same number of protons 15. Elements in a period have ...
... 13. The modern periodic table is organized by a. size of atom b. atomic mass c. number of neutrons d. atomic number 14. Elements in a group have a. a wide range of chemical properties b. the same atomic radius c. similar chemical properties d. the same number of protons 15. Elements in a period have ...
Honors Chemistry
... If the charges add up to zero, then just put the symbols together to form the formula. If the charges do not add up to zero, switch the charges and reduce. Example: Make a compound from acetate and calcium. Calcium goes first because ...
... If the charges add up to zero, then just put the symbols together to form the formula. If the charges do not add up to zero, switch the charges and reduce. Example: Make a compound from acetate and calcium. Calcium goes first because ...
ATOMIC THEORY WORKSHEET 1. Which of the following
... reactions the old bonds between atoms are broken down and new bonds are formed. Atoms, however, can be created or destroyed in nuclear reactions: radioactive decays, nuclear fission and fusion. ...
... reactions the old bonds between atoms are broken down and new bonds are formed. Atoms, however, can be created or destroyed in nuclear reactions: radioactive decays, nuclear fission and fusion. ...
ATOMIC THEORY WORKSHEET 1.
... reactions the old bonds between atoms are broken down and new bonds are formed. Atoms, however, can be created or destroyed in nuclear reactions: radioactive decays, nuclear fission and fusion. ...
... reactions the old bonds between atoms are broken down and new bonds are formed. Atoms, however, can be created or destroyed in nuclear reactions: radioactive decays, nuclear fission and fusion. ...
Atomic Structure - Northwest ISD Moodle
... Protons have a charge of +1 and are located in the nucleus with neutrons. Both are 1,840 times larger than electrons. ...
... Protons have a charge of +1 and are located in the nucleus with neutrons. Both are 1,840 times larger than electrons. ...
Unit 3 Study Guide
... Is this still true today? Explain. No, it is not true. In Dalton’s time technology for splitting atoms was not yet developed. 2. According to Dalton’s theory all atoms of the same element are identical in mass, size and properties. Is this still true today? Explain. Part of it is true. Atoms of the ...
... Is this still true today? Explain. No, it is not true. In Dalton’s time technology for splitting atoms was not yet developed. 2. According to Dalton’s theory all atoms of the same element are identical in mass, size and properties. Is this still true today? Explain. Part of it is true. Atoms of the ...
Review: theory vs law the atomic theory contributions of early scientists
... Neutron Heavy (similar to nucleus protons) Oct 711:36 AM ...
... Neutron Heavy (similar to nucleus protons) Oct 711:36 AM ...
PowerPoint_Atomic Structure
... he pounded up materials in his pestle and mortar until he had reduced them to smaller and smaller particles which he called ...
... he pounded up materials in his pestle and mortar until he had reduced them to smaller and smaller particles which he called ...
Chapter 2: Atoms, Molecules, and Ions
... Polyatomic ions – ______________________________________________________ 1. Same as writing formulas for binary ionic compounds (see above) but use the charge of the cation and the polyatomic anion. 2. You may need to use parentheses to prevent confusion! Example: Barium phosphate ...
... Polyatomic ions – ______________________________________________________ 1. Same as writing formulas for binary ionic compounds (see above) but use the charge of the cation and the polyatomic anion. 2. You may need to use parentheses to prevent confusion! Example: Barium phosphate ...
How Atoms Differ
... different atomic masses. Atoms of the same element having different numbers of neutrons. Hydrogen has three isotopes: Protium – 0 neutrons Deuterium – 1 neutron Tritium – 2 neutrons ...
... different atomic masses. Atoms of the same element having different numbers of neutrons. Hydrogen has three isotopes: Protium – 0 neutrons Deuterium – 1 neutron Tritium – 2 neutrons ...
neutrons
... number due to varying numbers of neutrons Isotopes are usually identified by specifying their mass number. Two methods for specifying isotopes: The mass number is written with a hyphen after the name of the element ex: hydrogen-3 is tritium Show the composition of a nucleus as the isotopes nucle ...
... number due to varying numbers of neutrons Isotopes are usually identified by specifying their mass number. Two methods for specifying isotopes: The mass number is written with a hyphen after the name of the element ex: hydrogen-3 is tritium Show the composition of a nucleus as the isotopes nucle ...
File
... Each element is composed of tiny indestructible particles called atoms All atoms of a given element have the same mass and properties that distinguishes them from other atoms/elements Atoms combine in simple, whole number ratios to form compounds ...
... Each element is composed of tiny indestructible particles called atoms All atoms of a given element have the same mass and properties that distinguishes them from other atoms/elements Atoms combine in simple, whole number ratios to form compounds ...
electrons.
... that were too small to be atoms. These negative particles were eventually called “electrons.” ...
... that were too small to be atoms. These negative particles were eventually called “electrons.” ...
Atomic terms - ATOMIC NUMBER: The number of protons in the
... - poor conductors of heat and electricity. Most nonmetals do not conduct well at all (insulators) - many of the nonmetals are gases at room temperature. A few solids, and one liquid (bromine) - color: Nonmetals may be white, black, purple, green, blue, orange, or colorless etc. - usually have low me ...
... - poor conductors of heat and electricity. Most nonmetals do not conduct well at all (insulators) - many of the nonmetals are gases at room temperature. A few solids, and one liquid (bromine) - color: Nonmetals may be white, black, purple, green, blue, orange, or colorless etc. - usually have low me ...
A time line discussion on the discovery of radioactivity and isotopes
... radium (which is millions of times more radioactive than uranium) in December. These elements were isolated only after a long series of chemical reactions, yet since these reactions did nothing to help or hinder the radioactivity, it became clear that this must be due to some property of the atoms t ...
... radium (which is millions of times more radioactive than uranium) in December. These elements were isolated only after a long series of chemical reactions, yet since these reactions did nothing to help or hinder the radioactivity, it became clear that this must be due to some property of the atoms t ...
Ch. 5 notes
... Dalton’s Atomic Theory 1. All matter is made of atoms 2. Atoms are indestructible and cannot be divided into smaller particles (later proved wrong) 3. All atoms of one element are exactly alike (later proved wrong), but they are different from atoms of other elements 4. Atoms combine in simple whol ...
... Dalton’s Atomic Theory 1. All matter is made of atoms 2. Atoms are indestructible and cannot be divided into smaller particles (later proved wrong) 3. All atoms of one element are exactly alike (later proved wrong), but they are different from atoms of other elements 4. Atoms combine in simple whol ...
Introduction to atoms
... Law of multiple proportions • Elements combining in more than one proportion will do so in multiples of whole numbers. • Examples: – H2O vs. H2O2. ...
... Law of multiple proportions • Elements combining in more than one proportion will do so in multiples of whole numbers. • Examples: – H2O vs. H2O2. ...
Chapter 4: Atomic Structure
... Au is the chemical symbol for gold. How many electrons does a gold atom have ...
... Au is the chemical symbol for gold. How many electrons does a gold atom have ...
Radioactive Decay (cont.)
... • Democritus (460–370 B.C.) was the first person to propose the idea that matter was not infinitely divisible, but made up of individual particles called atomos. • Aristotle (484–322 B.C.) disagreed with Democritus because he did not believe empty space could exist. • Aristotle’s views went unchalle ...
... • Democritus (460–370 B.C.) was the first person to propose the idea that matter was not infinitely divisible, but made up of individual particles called atomos. • Aristotle (484–322 B.C.) disagreed with Democritus because he did not believe empty space could exist. • Aristotle’s views went unchalle ...
Station 1 - The Periodic Table, Molecules and Molecular
... 1. What is the distinction between atomic number and mass number? Between mass number and atomic mass? 2. Distinguish between the terms family and period in connection with the periodic table. For which of these is the term group also used. 3. When metals react with nonmetals, an ionic compound gene ...
... 1. What is the distinction between atomic number and mass number? Between mass number and atomic mass? 2. Distinguish between the terms family and period in connection with the periodic table. For which of these is the term group also used. 3. When metals react with nonmetals, an ionic compound gene ...
atom
... • Atoms of different elements combine in simple wholenumber ratios to form chemical compounds. ...
... • Atoms of different elements combine in simple wholenumber ratios to form chemical compounds. ...
WAHS—Chemistry Unit 4: Atomic Structure 1 Unit Assignment #1
... 3. Compound Z is made by chemically combining elements X and Y. If only 4 grams of element Y were used to make 12 grams of compound Z, how many grams of element X were required? 4. According to the law of conservation of mass, if element A has a mass of 2 mass units, and element B has a mass of 3 ma ...
... 3. Compound Z is made by chemically combining elements X and Y. If only 4 grams of element Y were used to make 12 grams of compound Z, how many grams of element X were required? 4. According to the law of conservation of mass, if element A has a mass of 2 mass units, and element B has a mass of 3 ma ...
KEY - Mrs. Bonanno`s Chemistry Resources
... List the three subatomic particles, their symbols, charges and explain where they are located at in the structure of the atom. Proton, p+1, +1 charge, located in the nucleus Neutron, n0, no charge, located in the nucleus Electron, e-1, -1 charge, located in energy levels surrounding the nucleus ...
... List the three subatomic particles, their symbols, charges and explain where they are located at in the structure of the atom. Proton, p+1, +1 charge, located in the nucleus Neutron, n0, no charge, located in the nucleus Electron, e-1, -1 charge, located in energy levels surrounding the nucleus ...
Slide 1
... • the atomic number is usually found at the top of the box for each element in the periodic table. ...
... • the atomic number is usually found at the top of the box for each element in the periodic table. ...
Practice problems for chapter 1, 3 and 5 1) A small amount of salt
... Practice problems for chapter 1, 3 and 5 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 substa ...
... Practice problems for chapter 1, 3 and 5 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 substa ...
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.