Unit 1: Atoms, Molecules, and Ions
... Since the # of electrons no longer equals the # of protons, these atoms must be charged. A charged atom is called an ion. Cations are positively charged ions – they have lost electrons (and now have more protons than electrons) Anions are negatively charged ions – they have gained electrons (and now ...
... Since the # of electrons no longer equals the # of protons, these atoms must be charged. A charged atom is called an ion. Cations are positively charged ions – they have lost electrons (and now have more protons than electrons) Anions are negatively charged ions – they have gained electrons (and now ...
MSE 102 MATERIALS SCIENCE AND ENGINEERING ORIENTATION
... 3. Atoms of an element are neither created nor destroyed by any chemical reactions. Chemical reactions only involve the combination, rearrangement or separation of atoms. 4. Compounds are formed from the combination of atoms of more than one element. A compound always has the same relative number ...
... 3. Atoms of an element are neither created nor destroyed by any chemical reactions. Chemical reactions only involve the combination, rearrangement or separation of atoms. 4. Compounds are formed from the combination of atoms of more than one element. A compound always has the same relative number ...
Study Island Copyright © 2012 Study Island
... C. carbon dioxide; oxygen D. carbon dioxide; nitrogen ...
... C. carbon dioxide; oxygen D. carbon dioxide; nitrogen ...
Midterm Review
... Magnesium has three isotopes. Magnesium-24 makes up 78.99% of all magnesium atoms and has an atomic mass of 23.985. Magnesium-25 makes up 10.00% and has an atomic mass of 24.986. Magnesium-26 makes up 11.01% and has a mass of 25.982. What’s its atomic mass? ...
... Magnesium has three isotopes. Magnesium-24 makes up 78.99% of all magnesium atoms and has an atomic mass of 23.985. Magnesium-25 makes up 10.00% and has an atomic mass of 24.986. Magnesium-26 makes up 11.01% and has a mass of 25.982. What’s its atomic mass? ...
Atoms and the Periodic Table
... Democritus, 400 B.C.: Atoms make up all substances John Dalton, 1800’s: Proved that atoms exist Model of the atom went through many changes Electron Cloud Model: Current Model Electron Cloud Model: Electrons do not follow fixed orbits Electrons tend to occur more frequently in certain ar ...
... Democritus, 400 B.C.: Atoms make up all substances John Dalton, 1800’s: Proved that atoms exist Model of the atom went through many changes Electron Cloud Model: Current Model Electron Cloud Model: Electrons do not follow fixed orbits Electrons tend to occur more frequently in certain ar ...
An atom is an indivisible particle. is chemically indivisible. is the
... is defined by the electrons. ...
... is defined by the electrons. ...
Review Sheet Filled Out
... Electrons closest to the nucleus have the least amount of energy Electrons farthest away from the nucleus have the most energy – valence e Have a negative charge Have insignificant mass and volume Reside in the 99.996% of the atom outside the nucleus Can’t tell where an electron is at any ...
... Electrons closest to the nucleus have the least amount of energy Electrons farthest away from the nucleus have the most energy – valence e Have a negative charge Have insignificant mass and volume Reside in the 99.996% of the atom outside the nucleus Can’t tell where an electron is at any ...
Chapter 2 Atoms, Molecules, and Ions Learning a Language Outline
... • All atoms of the same element have the same chemical properties • In an ordinary chemical reaction • There is a change in the way atoms are combined with each other • Atoms are not created or destroyed • Compounds are formed when two or more atoms of ...
... • All atoms of the same element have the same chemical properties • In an ordinary chemical reaction • There is a change in the way atoms are combined with each other • Atoms are not created or destroyed • Compounds are formed when two or more atoms of ...
Early Models of the Atom
... most particles went through the foil, some were deflected at an angle and some bounced straight back Concluded that atom is mostly empty space and has a positive core – discovered the nucleus – came up with the planetary model of the atom – electrons were orbiting, nucleus full of mass (protons) Nam ...
... most particles went through the foil, some were deflected at an angle and some bounced straight back Concluded that atom is mostly empty space and has a positive core – discovered the nucleus – came up with the planetary model of the atom – electrons were orbiting, nucleus full of mass (protons) Nam ...
Chem Notes
... Chem 3 - Quantify Elements Lesson: Periodic Table - Big Blue identify the correct number of protons for an element identify the correct number of electrons for an element identify the correct number of neutrons for an element identify and use basic trends from the periodic table Chem8 - Bonding Less ...
... Chem 3 - Quantify Elements Lesson: Periodic Table - Big Blue identify the correct number of protons for an element identify the correct number of electrons for an element identify the correct number of neutrons for an element identify and use basic trends from the periodic table Chem8 - Bonding Less ...
NOTES Atomic Structure Number Mass.docx
... Initially, scientists tried classifying elements on the basis of their properties, but this didn’t work very well, since most of the known elements were metals, and all metals are malleable, shiny, conduct electricity, and are a similar color. Even where the colors were different, they could not be ...
... Initially, scientists tried classifying elements on the basis of their properties, but this didn’t work very well, since most of the known elements were metals, and all metals are malleable, shiny, conduct electricity, and are a similar color. Even where the colors were different, they could not be ...
Chemistry Honors Unit 2 Study Guide Atomic Theory Mr. Brown Use
... Joseph John Thomson- He discovered the electron and established that they were a part of all atoms. He measured the charge to mass ratio of the electron. He came up with the plum pudding model of the atom in which the electrons were thought to be evenly distributed throughout the atom as raisins are ...
... Joseph John Thomson- He discovered the electron and established that they were a part of all atoms. He measured the charge to mass ratio of the electron. He came up with the plum pudding model of the atom in which the electrons were thought to be evenly distributed throughout the atom as raisins are ...
Review - Final Exam
... 22. What are the valence electrons? What happens to the valence electrons across a row of representative elements and down a group? What information is gained from the valence electrons? Why do chemical families have similar properties? 23. Draw Lewis (Electron Dot) symbols for the elements across t ...
... 22. What are the valence electrons? What happens to the valence electrons across a row of representative elements and down a group? What information is gained from the valence electrons? Why do chemical families have similar properties? 23. Draw Lewis (Electron Dot) symbols for the elements across t ...
Chapter 2: The Composition and Structure of the Atom • 2.1 Matter
... The emission-spectrum of hydrogen leads to the modern understanding of the electronic structure of the atom. 2.5 The Bohr Atom o Initial understanding of the atom by Niels Bohr o Electrons exist in fixed energy levels surrounding the nucleus. The quantization of energy. o Promotion of an electron oc ...
... The emission-spectrum of hydrogen leads to the modern understanding of the electronic structure of the atom. 2.5 The Bohr Atom o Initial understanding of the atom by Niels Bohr o Electrons exist in fixed energy levels surrounding the nucleus. The quantization of energy. o Promotion of an electron oc ...
History of Atomic Theory Greek Model Democritus – 2,400 years ago
... Greek philosophers asked the question, Can matter be divided into smaller and smaller pieces forever – or is there a limit? Democritus said eventually the smallest piece would be reached - he named this smallest piece of matter an atom – from Greek word atomos meaning “not to be cut” ...
... Greek philosophers asked the question, Can matter be divided into smaller and smaller pieces forever – or is there a limit? Democritus said eventually the smallest piece would be reached - he named this smallest piece of matter an atom – from Greek word atomos meaning “not to be cut” ...
Presentation
... that can be broken down by chemical methods When they are broken down, the pieces have completely different properties than the compound. Made of molecules- two or more atoms ...
... that can be broken down by chemical methods When they are broken down, the pieces have completely different properties than the compound. Made of molecules- two or more atoms ...
Dalton`s Atomic Theory
... John Dalton (in 1805) proposes his Atomic Theory to explain the results of the quantitative studies of several scientists (including Lavoisier, Proust, and himself, among many others). Dalton’s Atomic Theory a. Elements consist of tiny, indivisible particles called atoms. b. All the atoms of a given ...
... John Dalton (in 1805) proposes his Atomic Theory to explain the results of the quantitative studies of several scientists (including Lavoisier, Proust, and himself, among many others). Dalton’s Atomic Theory a. Elements consist of tiny, indivisible particles called atoms. b. All the atoms of a given ...
Periodic table
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The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. The table also shows four rectangular blocks: s-, p- d- and f-block. In general, within one row (period) the elements are metals on the lefthand side, and non-metals on the righthand side.The rows of the table are called periods; the columns are called groups. Six groups (columns) have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized. The periodic table provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.Although precursors exist, Dmitri Mendeleev is generally credited with the publication, in 1869, of the first widely recognized periodic table. He developed his table to illustrate periodic trends in the properties of the then-known elements. Mendeleev also predicted some properties of then-unknown elements that would be expected to fill gaps in this table. Most of his predictions were proved correct when the elements in question were subsequently discovered. Mendeleev's periodic table has since been expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behavior.All elements from atomic numbers 1 (hydrogen) to 118 (ununoctium) have been discovered or reportedly synthesized, with elements 113, 115, 117, and 118 having yet to be confirmed. The first 94 elements exist naturally, although some are found only in trace amounts and were synthesized in laboratories before being found in nature. Elements with atomic numbers from 95 to 118 have only been synthesized in laboratories. It has been shown that einsteinium and fermium once occurred in nature but currently do not. Synthesis of elements having higher atomic numbers is being pursued. Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories.