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Nucleon number
Nucleon number

... 3) The ratio of mass/charge for each species is found from the value of the accelerating voltage associated with a particular peak. Many ions have a charge of +1 elementary charge unit, and the ratio m/e is numerically equal to m, the mass of the ion. (1 elementary charge unit = 1.60x10 19 C) 4) Th ...
Document
Document

... theory of the atom, with three basic parts: 1.Most of the atom’s mass and all of its positive charge are contained in a small core called a nucleus. 2.Most of the volume of the atom is empty space, throughout which tiny, negatively charged electrons are dispersed. 3.There are as many negatively char ...
All matter is made of atoms.
All matter is made of atoms.

... All matter is made of atoms. Think of all the substances you see and touch every day. Are all of these substances the same? Obviously, the substances that make up this book you’re reading are quite different from the substances in the air around you. So how many different substances can there be? Th ...
Answers to Review Questions for Atomic Theory
Answers to Review Questions for Atomic Theory

AtomMoleculeNaming_G1
AtomMoleculeNaming_G1

... differences in particle size. Filtration usually involves separating a precipitate from solution. Crystallization: Separation is based upon differences in solubility of the components in a mixture. Distillation: Separation is based upon differences in volatility. Extraction: Separation is based upon ...
Group 2 Elements
Group 2 Elements

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Chapter 4 power point notes
Chapter 4 power point notes

... positively charged particles in the nucleus called protons. • James Chadwick received the Nobel Prize in 1935 for discovering the existence of neutrons, neutral particles in the nucleus which accounts for the remainder of an atom’s mass. ...
ch 4 ppt - Madison County Schools
ch 4 ppt - Madison County Schools

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CMC Chapter 04
CMC Chapter 04

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Chapter 4 PPT
Chapter 4 PPT

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Chemical Reactions Chemistry - is the study of matter, its properties
Chemical Reactions Chemistry - is the study of matter, its properties

... This Family of elements are known as the Noble Gases and are electrically stable because their valence shell are already filled with electrons. (Draw several BohrRutherford Diagrams) Therefore, these elements will not react with the other elements and all other elements try to be like this Family. N ...
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File

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Lesson 5 Atomic Theory File
Lesson 5 Atomic Theory File

... Metals tend to form positive ions by losing electrons and nonmetals tend to form negative ions by gaining electrons. Orally: This exchange of electrons only occurs during a chemical reaction. So ions are a result of a chemical reaction that has already occurred. The periodic table lists elements tha ...
Chemistry Study Guide: Year 9 Science Page 1 Read your book C3
Chemistry Study Guide: Year 9 Science Page 1 Read your book C3

... but it had problems. For example, he put iron in the same group as oxygen and sulphur, which are two non-metals. As a result, his table was not accepted by other scientists v. In 1869, just five years after John Newlands put forward his law of octaves, a Russian chemist called Dmitri Mendeleev publi ...
Chapter 2
Chapter 2

... in a chemical reaction. Elements can only be converted into other elements in nuclear reactions. 3. All atoms of an element have the same number of protons and electrons, which determines the chemical behavior of the element. Isotopes of an element differ in the number of neutrons, and thus in mass ...
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Chapter 2

... (1+ ions only). Neon consists of three isotopes, of which neon-20 is by far the most abundant (90.48%). The mass of that isotope, to five decimal places, is 19.99244 amu on the carbon-12 scale. The number by each peak corresponds to the fraction of all Ne+ ions represented by the isotope with that m ...
Isotopic Notation - hrsbstaff.ednet.ns.ca
Isotopic Notation - hrsbstaff.ednet.ns.ca

... An instrument called the mass spectrometer is generally used to determine the percentages and individual masses of each isotope. ...
PP atoms - Lake County Schools
PP atoms - Lake County Schools

... 2. Atoms of the same element are identical whereas atoms of different elements differ 3. Atoms cannot be subdivided, created, or destroyed 4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds 5. In chemical reactions, atoms are combined, separated, or rearr ...
ISOTOPIC NOTATION isotopes are atoms with the same number of
ISOTOPIC NOTATION isotopes are atoms with the same number of

... An instrument called the mass spectrometer is generally used to determine the percentages and individual masses of each isotope. ...
Chemistry I Accelerated StudyGuideline
Chemistry I Accelerated StudyGuideline

... __________, that matter could not be created or destroyed. Then ___________ proposed, in his law of ____________ _____________, that the ratio of the masses of elements in any given compound is always the same. The law of _____________ ______________ , proposed soon after, states that the masses of ...
The Structure of the Atom
The Structure of the Atom

... •His experimental results revealed something different. Most alpha particles paths were not affected by any charge when in contact with gold foil. (Red straight lines on left diagram). Just a few deflected back at large angles. Knew it had to be of the same charge, because repelled. ...
Chapter 4 Atomic Structure
Chapter 4 Atomic Structure

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File - CToThe3Chemistry
File - CToThe3Chemistry

... 1. What is the atomic number? Where do you find the atomic number on your periodic table? The atomic number is the identifier for different elements’ atoms. It is found above the symbol for the element. 2. What is the relationship between the atomic number and the number of protons? The atomic numbe ...
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... 31. As an electron in a hydrogen atom moves from the second principal energy level to the first principal energy level, the energy of the atom A) decreases B) increases C) remains the same 32. An atom of oxygen is in an excited state. When an electron in this atom moves from the third shell to the s ...
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Dubnium

Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia (north of Moscow), where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.In the periodic table of the elements, it is a d-block element and in the transactinide elements. It is a member of the 7th period and belongs to Group 5. Chemistry experiments have confirmed that dubnium behaves as the heavier homologue to tantalum in group 5. The chemical properties of dubnium are characterized only partly. They are similar to those of other group 5 elements.In the 1960s and 1970s, microscopic amounts of dubnium were produced in laboratories in the former Soviet Union and in California. The priority of the discovery and therefore the naming of the element was disputed between Soviet and American scientists, and it was not until 1997 that IUPAC established ""dubnium"" as the official name for the element.
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